Hall, Marshall
Richard A. Brualdi
Alan C. Tucker
Alexander Kheyfits
Ivan Morton Niven
Symposia mathematica (1967- Rome)
MohammadReza Maleki
Dietmar Cieslik
Ross Honsberger
Henry H. Crapo
C. J. Colbourn
Henry Howland Crapo
British Combinatorial Conference (22nd 2009 University of St. Andrews)
British Combinatorial Conference (11th 1987 Goldsmiths' College)
Richard P. Stanley
Australian Conference on Combinatorial Mathematics (9th 1981 University of Queensland)
Winfried Hochsta ttler
Colloque de combinatoire énumérative (1985 Université du Québec à Montréal)
Combinatorial Theory Seminar (1971-73 Eindhoven University of Technology)
Australian Conference on Combinatorial Mathematics University of Newcastle 1979.