On Some Fixed Point Principles for Cones in Linear Normed Spaces. Gilles Fournier; Heinz-Otto Peitgen — 1977 Mathematische Annalen
Repulsive Fixed Points of Multivalued Transformations and the Fixed Point Index. Christian C. Fenske; Heinz-Otto. Peitgen — 1975 Mathematische Annalen
Leray endomorphisms and cone maps Gilles Fournier; Heinz-Otto Peitgen — 1978 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze