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1. Homological Algebra
2. Ringel-Hall Algebras
1. M. Chen, Y. Lin and S. Ruan. Stability approach to torsion pairs on abelian categories. J. Algebra 636 (2023), 560--602.
2. M. Chen. Exchange graphs and Ext-quivers of hearts of tube categories. Communications in Algebra, 54(2) (2026), 471--496.