Endomorphic cuts and tails Karel Čuda, Athanossios Tzouvaras (1987) Commentationes Mathematicae Universitatis Carolinae
Endomorphic universes and their standard extensions Antonín Sochor, Petr Vopěnka (1979) Commentationes Mathematicae Universitatis Carolinae
Extension of places and contraction properties for function fields over [...]-adically closed fields. Serban A. Basarab (1981) Journal für die reine und angewandte Mathematik