1. Prophet inequalities and order selection in optimal stopping problems;Hill,1983
2. Additive comparisons of stop rule and supremum expectations of uniformly bounded random variables;Hill,1981
3. On semiamarts, amarts, and processes with finite value;Krengel,1978
4. Stopping rules and tactics for processes indexed by a directed set;Krengel;J. Multivariate Anal.,1981