**Ars Combinatoria****Volume C, July, 2011**

**G.L. Chia and Carsten Thomassen**, “Grinberg’s Criterion Applied to Some Non-Planar Graphs”, pp. 3-7**Lihua Feng**, “The hyper-Wiener index of unicyclic graphs with given matching number”, pp. 9-17**Ruifang Liu, Huicai Jia and Jinlong Shu**, “On the spectra of tricyclic graphs”, pp. 19-32**Yian Xu**, “Acyclic edge coloring of triangle-free toroidal graphs”, pp. 33-42**Junior Michel, Jose M. Rodriguez, Jose M. Sigarreta and Maria Villeta**, “Hyperbolicity and parameters of graphs”, pp. 43-63**Lei Sun and Haiying Li**, “(2,1)-Total Labeling Of Planar Graphs With Large Girth And Low Maximum Degree”, pp. 65-72**Jishe Feng**, “More Identities On The Tribonacci Numbers”, pp. 73-78**Yanxun Chang, Giovanni Lo Faro and Antoinette Tripodi**, “Three types of edge-switchable kite systems”, pp. 79-96**Recep Sahin and Abdullah Altin**, “An Extension Of F_{1}, F_{2}, F_{3}Appell’s Hypergeometric Functions”, pp. 97-105**Wei Wang and Ni-Ni Xue**, “Connectivity of direct products of graphs”, pp. 107-111**Mahdieh Azari and Ali Iranmanesh**, “Computation of the edge Wiener indices of the sum of graphs”, pp. 113-128**Chuan-Min Lee**, “Signed and minus total domination on subclasses of bipartite graphs”, pp. 129-149**Boram Park and Yoshio Sano**, “On the hypercompetition numbers of hypergraphs”, pp. 151-159**Sei-Ichiro Ueki**, “Composition Operators On The Fock Space Of Vector-Valued Analytic Functions”, pp. 161-167**Jiansheng Cai, Liansheng Ge, Xia Zhang and Guizhen Liu**, “Edge-choosability of planar graphs without chordal 7-Cycles”, pp. 169-176**M. Mohammad-Noori**, “Some remarks about the derivation operator and generalized Stirling numbers”, pp. 177-192**Serhan Varma, Bayram Cekim and Fatma Tasdelen Yesildal**, “On Konhauser Matrix Polynomials”, pp. 193-204**Eduardo Saenz de Cabezon**, “Bordered magic squares: Elements for a comprehensive approach”, pp. 205-224**Kristina C. Garrett and Kendra Killpatrick**, “A Sign-Reversing Involution on Bimahonian Generating Functions”, pp. 225-237**C.S. Pettis**, “The Triangle Intersection Problem For Hexagon Triple Systems”, pp. 239-256**Gaowen Xi**, “Applications Of Liu’s q-Series Expansion Formula”, pp. 257-264**Adel T. Diab**, “On Cordial Labelings of Wheels with Other Graphs”, pp. 265-279**Wen Liu**, “On (l,m)-Walk-regular Digraphs”, pp. 281-287**M.R. Darafsheh and M.H. Khalifeh**, “Calculation of the Wiener, Szeged, and PI indices of a certain nanostar dendrimer”, pp. 289-298**Jinbo Li, Guizhen Liu and Bin Liu**, “On edge cover coloring of join graphs”, pp. 299-306**Yifei Hao, Xing Gao and Yanfeng Luo**, “On Cayley Graphs of Symmetric Inverse Semigroups”, pp. 307-319**Ramazan Karatas and Ali Gelisken**, “Qualitative Behavior Of A Rational Difference Equation”, pp. 321-326**Ling Wang and Heping Zhang**, “On Diameter Stability of the Johnson Graph”, pp. 327-335**Angel Plaza and Sergio Falcon**, “Short Proofs Of Combinatorial Identities For n!”, pp. 337-339**Hongchuan Lei, Huang-Lin Fu and Hao Shen**, “The Hamilton-Waterloo problem for Hamilton cycles and C_{4k}-factors”, pp. 341-347**Sarmad Abbasi**, “Effect of parallelism on the efficiency of binary tree search”, pp. 349-363**Hongbo Hua**, “On Maximum Merrifield-Simmons Index of Unicyclic Graphs with Prescribed Pendent Vertices”, pp. 365-379**H. Hedayati and B. Davvaz**, “Fundamental relation on Γ-hyperrings”, pp. 381-394**Wang Jing, Yuan Zihan and Huang Yuanqiu**, “On the Crossing Number of the Generalized Petersen Graph P(3k,k)”, pp. 395-407**Xing Gao, Wenwen Liu and Yanfeng Luo**, “On Cayley graphs of normal bands”, pp. 409-419**Turker Biyikoglu, Slobodan K. Simic and Zoran Stanic**, “Some Notes On Spectra Of Cographs”, pp. 421-434**T. Aaron Gulliver and Matthew G. Parker**, “Extended Binary Linear Codes from Legendre Sequences”, pp. 435-447**Xueliang Li and Yuefang Sun**, “Rainbow connection numbers of line graphs”, pp. 449-463**Teresa Sousa**, “Decompositions of graphs into a given clique-extension”, pp. 465-472**Lily L. Liu**, “Linear transformations preserving log-convexity”, pp. 473-483**Shailesh K. Tipnis, Michael J. Plantholt and Kaushal N. Badheka**, “On a well-spread halving of directed multigraphs”, pp. 485-491**Rui Li and Zhao Zhang**, “Super-Mixed-Connected Line Digraphs”, pp. 493-499**Y. Wu and H. Cao**, “On resolvable packing RMP(3,3,v) and covering RMC(3,3,v)”, pp. 501-529