@article{article976b59e7,
title   = {Schoenberg's theorem for positive definite functions on products: a unifying framework},
author = {Guella, Jean Carlo and Menegatto, Valdir Antônio},
year = {2019},
doi = {10.1007/s00041-018-9631-5},
journal   = {Journal of Fourier Analysis and Applications}
}