Hassen Aydi , Erdal Karapmnar , Calogero Vetro . MEIR-KEELER TYPE CONTRACTIONS FOR TRIPLED FIXED POINTS[J]. Acta mathematica scientia, Series B, 2012 , 32(6) : 2119 -2130 . DOI: 10.1016/S0252-9602(12)60164-7

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