Non tangential convergence for the Ornstein-Uhlenbeck semigroup. Pineda, Ebner, Urbina R., Wilfredo (2008) Divulgaciones Matemáticas
Norms for copulas. Darsow, William F., Olsen, Elwood T. (1995) International Journal of Mathematics and Mathematical Sciences
Note on nonlinear semigroups and free boundary problem for controlled Markov processes Makiko Nisio (1985) Banach Center Publications
Note on pasting of two Markov processes Masao Nagasawa (1976) Séminaire de probabilités de Strasbourg