@article{701040, title = {On Ulam's hypothesis}, booktitle = {Abstracta. 4th Winter School on Abstract Analysis}, series = {GDML\_Books}, publisher = {Czechoslovak Academy of Sciences}, address = {Praha}, year = {1976}, pages = {29-29}, url = {http://dml.mathdoc.fr/item/701040} }
Müller, V. On Ulam's hypothesis, dans Abstracta. 4th Winter School on Abstract Analysis, GDML_Books, (1976), p. 29. http://gdmltest.u-ga.fr/item/701040/