References
- Carroll , R.W. 1969 . Abstract methods in partial differential equations , New York : Harper S Row Publ .
- Giilespie , A. A. and Williams , B.B. 1983 . Fixed point theorems for expanding maps . Applicable Analysis 1H , : 161 – 165 .
- Schoneberg , R. 1981 . On the domain invariance theorem for accretive mappings . J. London Math. Soc , 2 : 548 – 554 .