中国科学院数学与系统科学研究院期刊网
Solvability of a Class of Operator Equations in Partially Ordered Complete Metric Space and in Partially Ordered Banach Space
San Yang LIU, Yu Qiang FENG
Acta Mathematica Sinica, Chinese Series . 2005, (1): 109 -114 .  DOI: 10.12386/A2005sxxb0012