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@article{MZ_1977__156_172573, author = {Walter Schempp}, title = {On {Functions} of {Positive} {Type} on {Commutative} {Monoids.}}, journal = {Mathematische Zeitschrift}, pages = {115--122}, publisher = {mathdoc}, volume = {156}, year = {1977}, zbl = {0367.22007}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__156_172573/} }
Walter Schempp. On Functions of Positive Type on Commutative Monoids.. Mathematische Zeitschrift, Tome 156 (1977), pp. 115-122. http://geodesic.mathdoc.fr/item/MZ_1977__156_172573/