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 Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, : 795—1052
 Three results on transcendental meromorphic solutions of certain nonlinear differential equations Nan Li, Lianzhong Yang Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 795—814
 Integral operators from Morrey type spaces to weighted BMOA spaces Ruishen Qian, Xiangling Zhu Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 815—828
 Domination parameters in Mycielski graphs Young Soo Kwon, Jaeun Lee, Moo Young Sohn Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 829—836
 A study of linked star operations Lokendra Paudel, Simplice Tchamna Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 837—851
 Algebraic Ricci solitons in the Finslerian case Guocheng Jiao, Zaili Yan Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 853—863
 Restricted polynomial extensions No-Ho Myung, Sei-Qwon Oh Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 865—876
 Almost rigidity of convex hypersurfaces via the extinction time of mean curvature flow Xian-Tao Huang Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 877—884
 Generalized self-inversive bicomplex polynomials with respect to the $j$-conjugation Yutaka Matsui, Yuhei Sato Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 885—895
 On pseudo 2-prime ideals and almost valuation domains Suat Ko\c{c} Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 897—908
 An interpolating Harnack inequality for nonlinear heat equation on a surface Hongxin Guo, Chengzhe Zhu Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 909—914
 A result on an open problem of L\"{u}, Li and Yang Sujoy Majumder, Somnath Saha Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 915—937
 Strongly Gorenstein $C$-homological modules under change of rings Yajuan Liu, Cuiping Zhang Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 939—958
 Minimal translation surfaces with respect to semi-symmetric connections in $\mathbb{R}^3$ and $\mathbb{R}^3_1$ Yong Wang Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 959—972
 Strong commutativity preserving maps of upper triangular matrix Lie algebras over a commutative ring Zhengxin Chen, Yu'e Zhao Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 973—981
 On the existence of solutions of Fermat-type differential-difference equations Jun-Fan Chen, Shu-Qing Lin Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 983—1002
 Maximal functions along twisted surfaces on product domains Ahmad Al-Salman Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 1003—1019
 $S$-Noetherian in bi-amalgamations Hwankoo Kim, Najib Mahdou, Youssef Zahir Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 1021—1029
 On finite groups with the same order type as simple groups $\mathrm{F}_4(q)$ with $q$ even Ashraf Daneshkhah, Fatemeh Moameri, Hosein Parvizi Mosaed Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 1031—1038
 On $\phi$-$w$-flat modules and their homological dimensions Xiaolei Zhang, Wei Zhao Bull. Korean Math. Soc. 2021 Vol. 58, No. 4, 1039—1052