MathSciNet bibliographic data MR2575542 47H10 (34B18 47N20 65J15) Zhai, Cheng-Bo; Cao, Xiao-Min Fixed point theorems for $\tau$$\tau$-$\phi$$\phi$-concave operators and applications. Comput. Math. Appl. 59 (2010), no. 1, 532–538. Article

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