Combinatorics, Complexity, and Logic

Quantum electronic devices based on metal-dieletric transition low-dimensional quantum structures, I. Antoniou et al; recognizing diameter critical graphs, R.P. Anstee and L. Caccetta; secret charing schemes absed on room squares, G.R. Chaudhry; Sierpinski's gasket, 2-groups and graph symmetries, C.G. Walker; a new pumping lemma for context-free languages, P. Domosi et al; on shuffle closures of commutative regular languanges, B. Imreh et al; combinatorial properties of sequences in groups and semigroups, A. Kelarev; a new proof search method for linear logic, S. Matsuoka.