editorial board

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EUROPEAN JOURNAL OF COMBINATORICS EDITORIAL BOARD C. BERGE L. LovAsz Centre de Mathematique Sociale, C.N.R.S., 54 Boulevard Raspail. 75006 Paris, France B. BOLLOBA.s University of Cambridge, 16 Mill Lane, Cambridge CB2 1SB, U.K. A. E. BROUWER University of Technology, Den Dolech 2, P.O. Box 513, 5600MB Eindhoven, The Netherlands F. BUEKENHOUT Universite Libre de Bruxelles, Boulevard du Triomphe, B-1050 Bruxelles, Belgium P. J. CAMERON Queen Mary College, London E14NS, U.K. M. DEZA C.N.R.S., Universite Paris VII (U.E.R. Maths), 2 place Jussieu, 75005 Paris, France P. ERDOS Hungarian Academy of Science, Realtanoda utca 11-13, Budapest 5, Hungary D. FOATA Universite Louis Pasteur, 7, rue Rene Descartes, 67084 Strasbourg, Cedex, France P. FRANKL ER175, Combinatoire, C.N.R.S., 54, Boulevard Raspail, 75006 Paris, Cedex 06, France R. L. GRAHAM Bell Laboratories. 600 Mountain Avenue, Murray Hill, New Jersey 07974, U.S.A. R. HALIN Universitlit Hamburg, 2000 Hamburg 13, Bundesstrasse 55, West Germany H. HANANI Technion-Institute of Technology, Technion City, Haifa, Israel M. IRI University of Tokyo, Bunkyo-ku, Tokyo, Japan A. A. IVANOV Academy of Sciences of the USSR, 9, Prospect 60 Let Oktyabrya, 117312 Moscow, USSR G. 0. H. KATONA Hungarian Academy of Sciences, Realtanoda utca 11-13, Budapest 5, Hungary M. LAS VERGNAS C.N.R.S., Universite Pierre et Marie Curie (U.E.R. 48-Maths), 4 place Jussieu, 75005 Paris, France B. LINDSTROM Royal Institute of Technology, Stockholm, Sweden Eotvos University, Budapest, Museum krt. 6-8, H-1088, Hungary W. MADER Institut fiir Mathematik der Universitlit Hannover, Welfengarten 1, 3000 Hannover 1, West Germany C. ST. J. A. NASH-WILLIAMS University of Reading, Whiteknights, Reading, RG62AX, U.K. A. PASINI Universita' degli Studi di Napoli, Via Claudio, 21, Cap. 80125 Napoli, Italy P. ROSENSTIEHL Centre de Mathematique Sociale, E.H.E.S.S., 54 Boulevard Raspail, 75006 Paris, France G.-C. ROTA Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A. H. SACHS Technische Hochschule Ilmenau, GDR M. P. SCHUTzENBERGER Universite Paris VII, (U.E.R. Maths), 2 place Jussieu, 75005 Paris, France J. J. SEIDEL Technische Hogeschool Eindhoven, Den Dolech 2, P.O. Box 513, 5600MB Eindhoven, The Netherlands N. M. SINGHI TATA Institute for Fundamental Research, Colaba, Bombay 40005, India V. T. S6s Hungarian Academy of Science, Realtanoda utca 11-13, Budapest 5, Hungary R. P. STANLEY Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, U.S.A. R. E. TARJAN Princeton University, Princeton, NJ 08544, U.S.A. C. THOMASSEN The Technical University of Denmark, building 303, DK-2800 Lyngby (Copenhagen), Denmark J. TITS College de France, 11 place Marcelin Berthelot, 75005 Paris, France W. T. TuiTE University of Waterloo, Waterloo, Ontario, Canada D. J. A. WELSH Merton College, Oxford University, Oxford, OX14JD, UK. Le Journal a ete prepare avec !'aide administrative de !'Ecole des Hautes Etudes en Sciences Sociales (Centre de Mathematique Sociale) du Centre Nationale de Ia Recherche Scientifique et du Programme de Recherches Coordonnees Mathematiques et Informatique. EUROPEAN JOURNAL OF COMBINATORICS: ISSN 0195-6698. Volume 11, 1990, published bi-monthly by Academic Press at 24-28 Oval Road. London NW1 7DX, UK. Annual subscription price including postage: £132 UK and US $248 overseas. Personal subscriptions available only for orders paid for out of personal funds: £48 UK and US $90 overseas. Subscriptions orders should be sent to Academic Press Limited, Foots Cray, Sidcup, Kent DA14 5HP, UK (Tel: 01-300-3322). Send notices of changes of address to the publisher at least 6-8 weeks in advance, including both old and new address. Second class postage rate paid at Jamaica, NY 11431, U.S.A. Air freight and mailing in the USA by Publications Expediting Inc., 200 Meacham Avenue, Elmont, NY 11003, USA. USA POSTMASTERS: send change of addresses to EUROPEAN JOURNAL OF COMBINATORICS, c/o Publications Expediting Inc., 200 Meacham Avenue, Elmont, NY 11003, USA. Printed in UK, on acid free paper.

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Page 1: Editorial Board

EUROPEAN JOURNAL OF COMBINATORICS

EDITORIAL BOARD

C. BERGE L. LovAsz Centre de Mathematique Sociale, C.N.R.S., 54 Boulevard Raspail. 75006 Paris, France B. BOLLOBA.s University of Cambridge, 16 Mill Lane, Cambridge CB2 1SB, U.K. A. E. BROUWER University of Technology, Den Dolech 2, P.O. Box 513, 5600MB Eindhoven, The Netherlands F. BUEKENHOUT Universite Libre de Bruxelles, Boulevard du Triomphe, B-1050 Bruxelles, Belgium P. J. CAMERON Queen Mary College, London E14NS, U.K. M. DEZA C.N.R.S., Universite Paris VII (U.E.R. Maths), 2 place Jussieu, 75005 Paris, France P. ERDOS Hungarian Academy of Science, Realtanoda utca 11-13, Budapest 5, Hungary D. FOATA Universite Louis Pasteur, 7, rue Rene Descartes, 67084 Strasbourg, Cedex, France P. FRANKL ER175, Combinatoire, C.N.R.S., 54, Boulevard Raspail, 75006 Paris, Cedex 06, France R. L. GRAHAM Bell Laboratories. 600 Mountain Avenue, Murray Hill, New Jersey 07974, U.S.A. R. HALIN Universitlit Hamburg, 2000 Hamburg 13, Bundesstrasse 55, West Germany H. HANANI Technion-Institute of Technology, Technion City, Haifa, Israel M. IRI University of Tokyo, Bunkyo-ku, Tokyo, Japan A. A. IVANOV Academy of Sciences of the USSR, 9, Prospect 60 Let Oktyabrya, 117312 Moscow, USSR G. 0. H. KATONA Hungarian Academy of Sciences, Realtanoda utca 11-13, Budapest 5, Hungary M. LAS VERGNAS C.N.R.S., Universite Pierre et Marie Curie (U.E.R. 48-Maths), 4 place Jussieu, 75005 Paris, France B. LINDSTROM Royal Institute of Technology, Stockholm, Sweden

Eotvos University, Budapest, Museum krt. 6-8, H-1088, Hungary W. MADER Institut fiir Mathematik der Universitlit Hannover, Welfengarten 1, 3000 Hannover 1, West Germany C. ST. J. A. NASH-WILLIAMS University of Reading, Whiteknights, Reading, RG62AX, U.K. A. PASINI Universita' degli Studi di Napoli, Via Claudio, 21, Cap. 80125 Napoli, Italy P. ROSENSTIEHL Centre de Mathematique Sociale, E.H.E.S.S., 54 Boulevard Raspail, 75006 Paris, France G.-C. ROTA Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A. H. SACHS Technische Hochschule Ilmenau, GDR M. P. SCHUTzENBERGER Universite Paris VII, (U.E.R. Maths), 2 place Jussieu, 75005 Paris, France J. J. SEIDEL Technische Hogeschool Eindhoven, Den Dolech 2, P.O. Box 513, 5600MB Eindhoven, The Netherlands N. M. SINGHI TATA Institute for Fundamental Research, Colaba, Bombay 40005, India V. T. S6s Hungarian Academy of Science, Realtanoda utca 11-13, Budapest 5, Hungary R. P. STANLEY Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, U.S.A. R. E. TARJAN Princeton University, Princeton, NJ 08544, U.S.A. C. THOMASSEN The Technical University of Denmark, building 303, DK-2800 Lyngby (Copenhagen), Denmark J. TITS College de France, 11 place Marcelin Berthelot, 75005 Paris, France W. T. TuiTE University of Waterloo, Waterloo, Ontario, Canada D. J. A. WELSH Merton College, Oxford University, Oxford, OX14JD, UK.

Le Journal a ete prepare avec !'aide administrative de !'Ecole des Hautes Etudes en Sciences Sociales (Centre de Mathematique Sociale) du Centre Nationale de Ia Recherche Scientifique et du Programme de Recherches Coordonnees Mathematiques et Informatique.

EUROPEAN JOURNAL OF COMBINATORICS: ISSN 0195-6698. Volume 11, 1990, published bi-monthly by Academic Press at 24-28 Oval Road. London NW1 7DX, UK. Annual subscription price including postage: £132 UK and US $248 overseas. Personal subscriptions available only for orders paid for out of personal funds: £48 UK and US $90 overseas. Subscriptions orders should be sent to Academic Press Limited, Foots Cray, Sidcup, Kent DA14 5HP, UK (Tel: 01-300-3322). Send notices of changes of address to the publisher at least 6-8 weeks in advance, including both old and new address.

Second class postage rate paid at Jamaica, NY 11431, U.S.A.

Air freight and mailing in the USA by Publications Expediting Inc., 200 Meacham Avenue, Elmont, NY 11003, USA.

USA POSTMASTERS: send change of addresses to EUROPEAN JOURNAL OF COMBINATORICS, c/o Publications Expediting Inc., 200 Meacham Avenue, Elmont, NY 11003, USA.

Printed in UK, on acid free paper.