**Ars Combinatoria **

**Volume XLV, April, 1997 **

**Hirobumi Mizuno and Iwao Sato, ** "Characteristic Polynomials of some covers of symmetric digraphs"

**Ernesto Dedo', Norma Zagaglia Salvi and Stephen J. Kirkland, ** "A Particular Class Of Bigraphs"

**Jayme L. Szwarcfiter, ** "Recognizing Clique-Helly Graphs"

**R.C. Mullin, A.C.H. Ling, R.J.R. Abel and F.E. Bennett, ** "On the Closure of Subsets of {4,5,...,9} which contain {4}"

**B.L. Hartnell, ** "On The Local Structure Of Well-Covered Graphs Without 4-Cycles"

**Dusan B. Jevtic, ** "On Sum Distinct Sets Of Integral Vectors"

**Jack M. Robertson and William A. Webb, ** "Near Exact and Envy Free Cake Division"

**John Ginsburg, ** "A coloring problem on chordal rings"

**Thomas Zaslavsky, ** "Is There a Matroid Theory of Signed Graph Embedding?"

**Ahmed M. Assaf, Nabil Shalaby and L.P.S. Singh, ** "On Packing Designs with Block Size 5 and Indexes 3 and 6"

**Clark Kimberling, ** "Fractal Sequences and Interspersions"

**F. Hurtado and M. Noy, ** "Counting triangulations of almost-convex polygons"

**Fair Barbour Hurst and Talmage James Reid, ** "Ramsey Numbers For Cocircuits In Matroids"

**M.C. Kong, Sin-Min Lee and Hugo S.H. Sun, ** "On Magic Strength of Graph"

**David W. Bange, Anthony E. Barkauskas and Lane H. Clark, ** "The Number of Orientations of a Tree Admitting an Efficient Dominating Set"

**Dingjun Lou, ** "A Local Neighbourhood Condition for Cycles"

**J.D. Fanning, ** "The Coexistence of Some Binary and N-Ary Designs"

**Glenn Hurlbert and Garth Isaak, ** "On Higher Dimensional Perfect Factors"

**Michael R. Pinter, ** "A Class Of Well-Covered Graphs With Girth Four"

**Xiafu Zhang and Hangfu Zhang, ** "Three Mutually Orthogonal Idempotent Latin Squares of Order 18"

**Lin Xiaohui, Jiang Wenzhou, Zhang Chengxue and Yang Yuansheng, ** "On Smallest Maximally Nonhamiltonian Graphs"

**Mirko Hornak, ** "Achromatic index of K12"

**Arbind Kumar Lal, ** "Some Games related to Permutation Group Statistics and their type B
Analogues"

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