Optimal stopping of a random length sequence of maxima over a random barrier Z. Porosiński (1988) Applicationes Mathematicae
Optimal stopping of a sequence of maxima over an unobservable sequence of maxima K. Szajowski (1984) Applicationes Mathematicae
Optimum stopping rules on the sequence of statistically dependent vectors Jiří Cochlar (1980) Kybernetika