Zero theorems of accretive operators. Hao, Yan (2011) Bulletin of the Malaysian Mathematical Sciences Society. Second Series
Zeros of accretive operators Simeon Reich, Ricardo Torrejón (1980) Commentationes Mathematicae Universitatis Carolinae
Zum Fixpunktverhalten nichtexpansiver Abbildungen Helmut Meister (1980) Commentationes Mathematicae Universitatis Carolinae