[S1] X.M. Song, J. L. Chen, On (m,n)-coherent modules and preenvelopes, J. Math. Res. Exp. (China),2008,28(1):57-66.
[S2] X.M. Song, J. L. Chen, Modules which are subisomorphic to their envelopes, Southeast Asian Bull. Math.,2007, 31(3): 579-587.
[S3] X.M. Song,A note on F-covers, J. Nanjing Univ. Math. Biquarterly , 2008, 25(1):50-55..
[S4] X.M Song.,J. L. Chen, Relatively injective modules with respect to torsion theory, Chin. Quart., J. of Math., 2007, 22(4): 500-503.
[S5] X.M. Song, Regularity of rings whose every simple singular left R-module is GP-injective,Northeast Math. J., 2005, 21(1): 39-44.
[S6] X.M. Song,X. B. Yin, Generalization of V-rings, Kyungpook Math. J., 2005, 45(3): 357-362.
[S7] X.M. Song, J. L. Chen , Notes on pure projective modules, J. Southeast Univ. (English Edition), 2005, 21(4): 506-508.
[S8] 宋贤梅,关于特殊的F-预覆盖与F-预包络,安徽师范大学学报(自然科学版),2006,29(6): 511-513.