中国科学院数学与系统科学研究院期刊网
AMS
On the Solvability of Implicit Functional Equations with Applications to Discontinuous Differential Equations
S. Heikkilä
Acta Mathematica Sinica . 2006, (1): 223 -232 .  DOI: 10.1007/s10114-005-0558-9