Combinatorics: Room Squares, Sum-Free Sets, Hadamard Matrices Lecture Notes in Mathematics, nr. 292 Autor W. D. Wallis et al. 23 oct 1972 Paperback Preț: 411.57 lei 6-8 săpt.
Combinatorial Mathematics IX: Proceedings of the Ninth Australian Conference on Combinatorial Mathematics Held at the University of Queensland, Brisbane, Australia, August 24-28, 1981 Lecture Notes in Mathematics, nr. 952 Editat de E. J. Billington et al. sep 1982 Paperback Preț: 407.87 lei 6-8 săpt.