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@article{AM2_1969__2_182320, author = {E. LUK\'ACS}, title = {Non-Negative {Definite} {Solutions} of {Certain} {Differential} and {Functional} {Equations} {Reports} of {Meetings}}, journal = {Aequationes mathematicae}, pages = {137--143}, publisher = {mathdoc}, volume = {2}, year = {1969}, zbl = {0174.20203}, url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182320/} }
E. LUKÁCS. Non-Negative Definite Solutions of Certain Differential and Functional Equations Reports of Meetings. Aequationes mathematicae, Tome 2 (1969), pp. 137-143. http://geodesic.mathdoc.fr/item/AM2_1969__2_182320/