Dalang, Robert C.2008-12-012008-12-012008-12-01198810.1007/BF00334200https://infoscience.epfl.ch/handle/20.500.14299/31994WOS:A1988P381800003infinite zero-one matricesinfinite perfect graphsconvex set of random measuresoptimal stopping problems for two-parameter processesextremal elementsOn infinite perfect graphs and randomized stopping points on the planetext::journal::journal article::research article