Volume XXXI, April, 1991

Research Article

On bicovers of pairs by quintuples: v odd, v≢3 (mod 10)

Mullin, R. C.; Horton, J. D.; Mills, W. H.

Ars Comb. 31, 3-19 (1991).

Research Article

Counting special sets of binary Lyndon words

Yucas, Joseph L.

Ars Comb. 31, 21-29 (1991).

Research Article

A bijective proof for the parity of Stirling numbers

Collins, Karen L.; Hovey, Mark

Ars Comb. 31, 31-32 (1991).

Research Article

Orthogonal Steiner triple systems of order 6m+3

Stinson, D. R.; Zhu, Lie

Ars Comb. 31, 33-63 (1991).

Research Article

Minimum triangle-free graphs

Radziszowski, Stanisław P.; Kreher, Donald L.

Ars Comb. 31, 65-92 (1991).

Research Article

A characterization of fractionally well-covered graphs

Currie, James; Nowakowski, Richard

Ars Comb. 31, 93-96 (1991).

Research Article

On a class of linear spaces with 16 points

Franek, F.; Mathon, R.; Rosa, A.

Ars Comb. 31, 97-104 (1991).

Research Article

Steiner heptagon systems

Manduchi, Elisabeth

Ars Comb. 31, 105-115 (1991).

Research Article

Ramsey minimal graphs for forests

Faudree, Ralph

Ars Comb. 31, 117-124 (1991).

Research Article

Addendum to: On the construction of color-critical linear hypergraphs

Abbott, H. L.; Hare, D. R.

Ars Comb. 31, 125-126 (1991).

Research Article

On the cordiality of some specific graphs

Kirchherr, Walter W.

Ars Comb. 31, 127-138 (1991).

Research Article

Neighborhood unions and highly Hamiltonian graphs

Faudree, Ralph J.; Gould, Ronald J.; Jacobson, Michael S.; Lesniak, Linda

Ars Comb. 31, 139-148 (1991).

Research Article

On the vulnerability of permutation graphs of complete and complete bipartite graphs

Guichard, D.; Piazza, B.; Stueckle, S.

Ars Comb. 31, 149-157 (1991).

Research Article

k-saturated graphs of chromatic number at least k

Hanson, D.; Toft, B.

Ars Comb. 31, 159-164 (1991).

Research Article

Symmetric designs with λ=2 admitting PSL(2,q) fixing a block

Fanning, J. D.

Ars Comb. 31, 165-170 (1991).

Research Article

Composing functions to reduce image size

Sauer, N.; Stone, M. G.

Ars Comb. 31, 171-176 (1991).

Research Article

A Turan-type problem on 3-graphs

Zhou, Bing

Ars Comb. 31, 177-181 (1991).

Research Article

A lattice generated by (0,1)-matrices

Brualdi, Richard A.; Liu, Bolian

Ars Comb. 31, 183-190 (1991).

Research Article

Minimal number of cuts for fair division

Robertson, Jack M.; Webb, William A.

Ars Comb. 31, 191-197 (1991).

Research Article

Contractible edges in 4-connected maximal planar graphs

McCuaig, William D.; Haglin, David J.; Venkatesan, Shankar M.

Ars Comb. 31, 199-203 (1991).

Research Article

Reguli in translation planes defined by flocks of hyperbolic quadrics

Johnson, N. L.

Ars Comb. 31, 205-210 (1991).

Research Article

Incomplete perfect Mendelsohn designs

Bennett, F. E.; Chen, Maorong

Ars Comb. 31, 211-216 (1991).

Research Article

A new assignment model and its algorithms

Song, Zengmin; Zhang, Kemin

Ars Comb. 31, 217-221 (1991).

Research Article

Domination number of products of graphs

El-Zahar, M.; Pareek, C. M.

Ars Comb. 31, 223-227 (1991).

Research Article

Fusion schemes and partially balanced incomplete block designs

Hemmeter, Joe; Woldar, Andrew

Ars Comb. 31, 229-236 (1991).

Research Article

A property of t-wise balanced designs

Kageyama, Sanpei

Ars Comb. 31, 237-238 (1991).

Research Article

Cycle-book Ramsey numbers

Faudree, R. J.; Rousseau, C. C.; Sheehan, J.

Ars Comb. 31, 239-248 (1991).

Research Article

On the construction of cordial graphs

Seah, Eric

Ars Comb. 31, 249-254 (1991).

Research Article

Some small packing numbers

Gardner, B.

Ars Comb. 31, 255-258 (1991).

Research Article

Regular triangulations of non-compact surfaces

Mohar, Bojan

Ars Comb. 31, 259-266 (1991).

Research Article

Almost selfcomplementary graphs. I

Das, Pramod K.

Ars Comb. 31, 267-276 (1991).

Research Article

Totally colouring a graph with maximum degree four

Jones, Kathryn F.; Ryan, Jennifer

Ars Comb. 31, 277-285 (1991).

Research Article

On the packing of pairs by quintuples with index 2

Yin, Jianxing

Ars Comb. 31, 287-301 (1991).

Research Article

Eulerian subgraphs in a class of graphs

Lai, Hong-Jian

Ars Comb. 31, 302-311 (1991).

Research Article

The chromatic index of an abelian Cayley graph

Broere, Izak; Hattingh, Johannes H.

Ars Comb. 31, 312-316 (1991).