**Ars Combinatoria****Volume CIV, April, 2012**

**Qiong-yang Wu, Yan-bing Zhao and Yuan-ji Huo**, “Lattice of all subsets of a finite set and partition lattice of a n-set”, pp. 3-11**Lihua Feng, Aleksandar Ilic and Guihai Yu**, “On the second maximal and minimal Wiener index of unicyclic graphs with given girth”, pp. 13-22**Yang Yuansheng, Fu Xueliang and Jiang Baoqi**, “On the Packing Number of Generalized Petersen Graphs P(n,2)”, pp. 23-32**Damei Lu, Wensong Lin and Zengmin Song**, “Distance two labelings of Cartesian products of complete graphs”, pp. 33-40**B. Bhattacharjya and A.K. Lal**, “On the Magic Space of Locally Finite Graphs”, pp. 41-64**Shasha Li, Wei Li and Xueliang Li**, “The generalized connectivity of complete bipartite graphs”, pp. 65-79**Selda Kucukcifci, Emine Sule Yazici and Charles Curtis Lindner**, “The full metamorphosis of λ-fold block designs with block size four into λ-fold 4-cycle systems”, pp. 81-96**Ming-Ju Lee**, “On super (a,1)-edge entimagic total labelings of grids and crowns”, pp. 97-105**Vincent Ranwez, Stefan Janaqi and Sylvie Ranwez**, “An O(n . m) algorithm for calculating the closure of lca-type operators”, pp. 107-128**Zeling Shao and Yanpei Liu**, “On the number of genus embeddings of complete tripartite graph K_{n,n,l}“, pp. 129-142**A. Elumalai and G. Sethuraman**, “Gracefulness Of A Cycle With Parallel Chords And Parallel P_{k}-Chords Of Different Lengths”, pp. 143-148**Fatih Yilmaz and Durmus Bozkurt**, “Some Properties of Padovan Sequence by Matrix Methods”, pp. 149-160**Cheng-Kuan Lin, Tung-Yang Ho, Jimmy J.M. Tan and Lih-Hsing Hsu**, “Super Spanning Connectivity of Augmented Cubes”, pp. 161-177**Lutz Volkmann**, “The smallest regular graphs which are not 1-extendable”, pp. 179-184**Daili, Wang zheng-hua and Xie zheng**, “Gracefulness of P_{2r,2m}“, pp. 185-191**Xiaolin Chern and Xueliang Li**, “A solution to a conjecture on two rainbow connection numbers of a graph”, pp. 193-196**Dianhua Wu, Qing Shu, Ryoh Fuji-Hara, Desheng Li and Shuming Chen**, “The existence of doubly disjoint (mt+1,m,m-1) difference families”, pp. 197-209**Rundan Xing, Bo Zhou and Ante Graovac**, “On Sum-Balaban Index”, pp. 211-223**M. Hussain, Edy Tri Baskoro and Kashif Ali**, “On super antimagic total labeling of Harary graph”, pp. 225-233**Luozhong Gong and Weijun Liu**, “Fourth order Randic index of phenylenes”, pp. 235-240**M.A. Seoud, A. El Sonbaty and A.E.A. Mahran**, “On Prime Graphs”, pp. 241-260**Lingping Zhong**, “The Harmonic Index on Unicyclic Graphs”, pp. 261-269**Maged Z. Youssef**, “On E_{k}-cordial labeling”, pp. 271-279**Guoling Li and Qianhong Zhang**, “A note on the Merrifield-Simmons index of connected graphs”, pp. 281-287**Jinyan Wang, Jianming Zhan and Wenxiang Gu**, “Some new results on soft hypermodules”, pp. 289-306**Gek L. Chia and Carsten Thomassen**, “On the Number of Longest and Almost Longest Cycles in Cubic Graphs”, pp. 307-320**Terry Eddy and M.M. Parmenter**, “Groups With Restricted Squaring Properties”, pp. 321-331**M. Ariannejad and M. Emami**, “Notes on the Support of t-Designs”, pp. 333-339**Hongtao Zhao and Feifei Fan**, “Large sets of P_{3}-decompostitions of complete multipartite graphs”, pp. 341-352**Pentti Haukkanen and Jorma K. Merikoski**, “Some formulas for numbers of line segments and lines in a rectangular grid”, pp. 353-361**Jason Brown and Richard Hoshino**, “On Circulants Uniquely Characterized by their Independence Polynomials”, pp. 363-374**G.H. Fath-Tabar and A. Loghman**, “On Vertex Matching Polynomial of Graphs”, pp. 375-384**Mingqing Zhai, Guanglong Yu and Jinlong Shu**, “Clique number and distance spectral radii of graphs”, pp. 385-392**Boris Horvat and Tomaz Pisanski**, “Unit distance representations of the Petersen graph in the plane”, pp. 393-415**M.H. Armanious**, “On Steiner Quasigroups of Cardinality 21”, pp. 417-430**Xin Zhang and Guizhen Liu**, “On edge colorings of 1-planar graphs without chordal 5-cycles”, pp. 431-436**Taekyun Kim, Cheon Seoung Ryoo and Heungsu Yi**, “A Note On q-Bernoulli Numbers And q-Bernstein Polynomials”, pp. 437-447**Jamshid Moori and B.G. Rodrigues**, “Some ternary codes invariant under the group M^{c}L:2″, pp. 449-462**Robert Brier**, “The variety generated by the class of K-perfect m-cycle systems”, pp. 463-479**Jian-Hua Yin, Jiong-Sheng Li and Wen-Ya Li**, “Potentially K_{1,1,t}-graphic sequences”, pp. 481-488**Lihua Feng and Aleksandar Ilic**, “The Laplacian spectral radius of graphs with given connectivity”, pp. 489-495**Louis W. Kolitsch**, “A Look at the Reciprocal of the Generating Function for p-Regular Partitions”, pp. 497-503**Y. Yazlik and N. Taskara**, “Spectral norm, Eigenvalues and Determinant of Circulant Matrix involving the Generalized k-Horadam numbers”, pp. 505-512**M. Tariq Rahim and Ioan Tomescu**, “Multi-level distance labelings for helm graphs”, pp. 513-523**Juan Liu, Jixiang Meng and Xindong Zhang**, “The Transformation Digraph D^{++-}“, pp. 525-535