1. Topological Semifields;Antonovskij,1960
2. Fixed points and partial orders;Br∅ndsted;Proc. Am. math. Soc.,1976
3. Normed Linear Spaces;Day,1973
4. Linear Operators I;Dunford,1958
5. Comparison principle and nonlinear contractions in abstract spaces;Eisenfeld;J. math. Analysis Applic.,1975