Optimal selection of the maximum of a discountable sequence of independent random variables Z. Porosiński — 1985 Applicationes Mathematicae
Optimal stopping of a random length sequence of maxima over a random barrier Z. Porosiński — 1988 Applicationes Mathematicae
Full-information best choice problems with imperfect observation and a random number of observations Z. Porosiński — 1991 Applicationes Mathematicae
Optimal stopping of a sequence of maxima between random and fixed barriers Z. Porosiński — 1988 Applicationes Mathematicae