@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/