Duke Mathematical Journal · 1942 · 572 citations · 4 references
Natural SciencesAstronomyGravitySpherical GeometryPositive Definite FunctionsPositive Definiteness
4
Metric Spaces and Completely Monotone Functions
I. J. Schoenberg · Annals of Mathematics · 1938 · 995 citations
Hilbert Distances and Positive Definite Functions
S. Bochner · Annals of Mathematics · 1941 · 90 citations