Dalang, Robert C.2008-12-012008-12-012008-12-01198910.2307/2001425https://infoscience.epfl.ch/handle/20.500.14299/32011nonstandard analysisoptimal stopping problemrandomized stopping timesnonstandard probability theoryLoeb spacesconditional independence propertyOptimal stopping of two-parameter processes on nonstandard probability spacestext::journal::journal article::research article