@article{700203,
     title = {Non-expansive mappings in convex linear topological spaces},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Slovensk\'e pedagogick\'e nakladate\v lstvo},
     address = {Bratislava},
     year = {1967},
     pages = {289-292},
     mrnumber = {MR0253106},
     zbl = {0185.22204},
     url = {http://dml.mathdoc.fr/item/700203}
}

DePrima, C. R. Non-expansive mappings in convex linear topological spaces, dans Differential Equations and Their Applications, GDML_Books,  (1967), pp. 289-292. http://gdmltest.u-ga.fr/item/700203/