1. Fuzzy sets
2. Fuzzy groups
3. Rabi H. Jaber, Prime Fuzzy Submodules and Prime Fuzzy Modules, M.Sc.Thesis, University of Baghdad, 2001.
4. Hatam Y. Khalaf, Fuzzy Quasi-Prime Modules and Fuzzy Quasi-Prime Submodules, M.Sc. Thesis, University of Baghdad, 2001.
5. Helen K. Saikia and Mrinal C. Kalita, On Fuzzy Essential submodules, J. Fuzzy Math. 17(1), (2009), 109– 117.