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- [c1]Hai-Long Yang: Interval Valued Fuzzy Rough Set Model on Two Different Universes and Its Application. RSCTC 2012: 66-72
- [j1]Hai-Long Yang: A note on "Rough set theory based on two universal sets and its applications" Knowledge-Based Systems 23 (2010) 110-115. Knowl.-Based Syst. 24(3): 465-466 (2011)