Janusz BRZDȨ , K , Krzysztof CIEPLINSKI . ON A FIXED POINT THEOREM IN 2-BANACH SPACES AND SOME OF ITS APPLICATIONS[J]. Acta mathematica scientia, Series B, 2018 , 38(2) : 377 -390 . DOI: 10.1016/S0252-9602(18)30755-0

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