1. B. Davvaz and Y. A. Parnian-Garamaleky, Bull. Malaysian Math. Soc. (Second Series), 22, pp. 53–56 (1999).
2. A GENERALIZATION OF HOMOLOGICAL ALGEBRA
3. Construction of U-extension module
4. Y. Mahatma, “Construction of the 𝒰-Projective Resolutions and the 𝒰-Extension Modules,” Doctorate dissertation, Institut Teknologi Bandung, 2020.
5. Y. Mahatma, I. Hadi, and B. Sumargo, “Long Exact Sequence of 𝒰-Extension Modules”, presented in The 5th Annual Applied Science and Engineering Conference, August 2020.