@article{AM2_1969__2_182312,
     author = {E. LUKACS},
     title = {Non {Negative} {Definite} {Solutions} of {Certain} {Differential} and {Functional} {Equations} {(Short} {Communication)}},
     journal = {Aequationes mathematicae},
     pages = {128--128},
     publisher = {mathdoc},
     volume = {2},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182312/}
}