[1] Banach S. Sur les operations dans ensembles abstraits et application aux equations integerate. Fnd Math, 1922, 3: 133--181
[2] C'iri'c L B. A generalization of Banach' contraction principle. Proc Am Math Soc, 1974, 45(2): 133--181
[3] Nadler S B. Multi-valued contraction mappings. Pacific J Math, 1969, 30: 475--488
[4] Mizoguchi N, Takahashi W. Fixed point theorems for multi-valued mappings on complete metric spaces. J Math Anal
Appl, 1989, 141: 177--188
[5] Amini-Harandi A. Fixed point theory for set-valued quasi-contraction maps in metric spaces. Appl Math Lett, 2011, 141: 1791--1794
[6] Assad N A, Kirk W A. Fixed point theorems for set-valued mappins of contractive type. Pacific J Math, 1972, 43: 553--562
[7] Wu J R, Liu H Y. Common fixed point theorems for sequences of Φ-type contraction set-valued mappings. Chin
Quart J of Math, 2009, 24(4)}: 504--510 |