1. A finite difference function theory;Isaacs;Univ. Nac. Tucuman Rev.,1941
2. The finite differences of polygenic functions;Isaacs;Bull. Am. Math. Soc.,1941
3. Monodiffric functions;Isaacs,1950
4. Fonctions preharmonique et fonctions preholomorphis;Ferrand;Bull. Sci. Math.,1944
5. A first contribution to the geometry of monodiffric polynomials;Terrancini;Actas Acad. Ci. Lima,1945