1. Limit semigroups of Bernstein-Schnabl operators associated with positive projections;Altomare;Ann. Sc. Norm. Sup. Pisa, Serie IV,1989
2. On some classes of Lototsky-Schnabl operators;Altomare;To appear in Note di Matematica,1991
3. Indag. Math;Clément;On Co-semigroups generated by differential operators satisfying Wentcel's boundary conditions,1986
4. The parabolic differential equations and the associated semi-groups of transformations;Feller;Ann. of Math.,1952
5. Otsky-Schnabl functions on compact convex sets;Grossman;J. LotMath. Anal. Appl.,1976