Combinatorial Mathematics IV [electronic resource] : Proceedings of the Fourth Australian Conference Held at the University of Adelaide August 27–29, 1975 / edited by Louis R. A. Casse, Walter D. Wallis.

Comma-free codes and incidence algebras -- Non-orthogonal graeco-latin designs -- An infinite family of skew weighing matrices -- Some elementary aspects of the catalan numbers -- Some new constructions for orthogonal designs -- Bounds of finite relations -- Products of graphs and their spectra -- Some computational results on the spectra of graphs -- A non-imbeddable proper colouring -- Minimal degree of primitive permutation groups -- Number of factors in K-cycle decompositions of permutations -- Some incidence structures of maximal rank -- A theorem on planar graphs -- The number and stability indices of Cn-trees -- On crystallographic colour groups -- Designs from cyclotomy -- Bordered symmetric square roots of the identity matrix -- Integer sequences with given sum and restricted differences -- Orthogonal designs in order sixteen -- Counting arrangements of bishops -- The principle of random union of gametes in a finite population -- The stability index of the product of a path and a tree -- Computation of g(1,3;12) -- Embedding proper colourings -- Some large subsquares.