scholarly journals Fixed-point theorems of φ concave-(−ψ) convex mixed monotone operators and applications

2004 ◽  
Vol 295 (2) ◽  
pp. 645-657 ◽  
Author(s):  
Shaoyuan Xu ◽  
Baoguo Jia
2011 ◽  
Vol 74 (5) ◽  
pp. 1749-1760 ◽  
Author(s):  
J. Harjani ◽  
B. López ◽  
K. Sadarangani

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