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 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 669—885Download front and back covers
 On Lorentzian quasi-Einstein manifolds Absos Ali Shaikh, Young Ho Kim, and Shyamal Kumar Hui MSC numbers : 53B30, 53B50, 53C50, 53C80, 83D05 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 669—689
 The competition numbers of Hamming graphs with diameter at most three Boram Park and Yoshio Sano MSC numbers : Primary 05C99 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 691—702
 Vector-valued inequalities for the commutators of singular integrals with rough kernels Lin Tang and Huoxiong Wu MSC numbers : 42B20, 42B25, 42B35 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 703—725
 Existence and global exponential stability of a periodic solution to discrete-time Cohen-Grossberg BAM neural networks with delays Zhengqiu Zhang and Liping Wang MSC numbers : 34D23, 39A13 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 727—747
 Morse homology on noncompact manifolds Kai Cieliebak and Urs Frauenfelder MSC numbers : 53D40 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 749—774
 Disturbance attenuation for a class of discrete-time switched systems with exponential uncertainty Changlin Li, Fei Long, and Guohui Ren MSC numbers : 93C05, 93C55, 93D05, 93D21 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 775—795
 The classification of log Enriques surfaces of rank 18 Fei Wang MSC numbers : Primary 14J28; Secondary 14J17, 14J50 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 797—822
 Continuity of ($\alpha,\beta$)-derivations of operator algebras Chengjun Hou and Qing Meng MSC numbers : 46H40, 46L57 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 823—835
 Ternary universal sums of generalized pentagonal numbers Byeong-Kweon Oh MSC numbers : Primary 11E12, 11E20 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 837—847
 Differential equations characterizing timelike and spacelike curves of constant breadth in Minkowski 3-space $E_1^3$ Mehmet \"{O}nder, H\"{u}seyin Kocayi\u{g}it, Elif Candan MSC numbers : 34A05, 53C40, 53C50 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 849—866
 Solutions of quasilinear wave equation with strong and nonlinear viscosity Jin-soo Hwang, Shin-ichi Nakagiri, and Hiroki Tanabe MSC numbers : 35B30, 35L70 J. Korean Math. Soc. 2011 Vol. 48, No. 4, 867—885