@article{701067,
     title = {A common generalization of Kelley's theorem (concerning measures on Boolean algebra) and on von Neumann's minimax theorem},
     booktitle = {Abstracta. 4th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1976},
     pages = {155-157},
     url = {http://dml.mathdoc.fr/item/701067}
}

Wilhelm, Marek. A common generalization of Kelley's theorem (concerning measures on Boolean algebra) and on von Neumann's minimax theorem, dans Abstracta. 4th Winter School on Abstract Analysis, GDML_Books,  (1976), pp. 155-157. http://gdmltest.u-ga.fr/item/701067/