1. A new approach to the definition of topological degree for multivalued mappings;Cellina;Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur.,1969
2. Sur l'application semi-continue dont la valeur est un compact convexe;Hukuhara;Funkcial Ekvac.,1967
3. Degré pour les fonctions multivoques et applications;Lasry;C. R. Acad. Sci. Paris Sér. A-B,1975
4. Topological degree for set-valued compact vector fields in locally convex spaces;Ma;Dissertationes Math. Rozprawy Mat.,1972