@article{701062,
title = {Positive definite functions on Abelian semigroups},
booktitle = {Abstracta. 4th Winter School on Abstract Analysis},
series = {GDML\_Books},
publisher = {Czechoslovak Academy of Sciences},
address = {Praha},
year = {1976},
pages = {135-139},
url = {http://dml.mathdoc.fr/item/701062}
}
Ressel, Paul. Positive definite functions on Abelian semigroups, dans Abstracta. 4th Winter School on Abstract Analysis, GDML_Books, (1976), pp. 135-139. http://gdmltest.u-ga.fr/item/701062/