GRIGELIONIS, B. Sufficiency in the optimal stopping problems. Lithuanian Mathematical Journal, [S. l.], v. 9, n. 3, p. 471–480, 1969. DOI: 10.15388/LMJ.1969.20795. Disponível em: https://www.journals.vu.lt/LMJ/article/view/20795.. Acesso em: 3 may. 2024.