Geodesic
On sufficient conditions for positive definiteness of radial functions in domains of $\mathbf{R}^N$
Doklady Akademii Nauk, Tome 267 (1982) no. 2, pp. 305-310 
A. V. Romanov. On sufficient conditions for positive definiteness of radial functions in domains of $\mathbf{R}^N$. Doklady Akademii Nauk, Tome 267 (1982) no. 2, pp. 305-310. http://geodesic.mathdoc.fr/item/DAN_1982_267_2_a11/
@article{DAN_1982_267_2_a11,
     author = {A. V. Romanov},
     title = {On sufficient conditions for positive definiteness of radial functions in domains of $\mathbf{R}^N$},
     journal = {Doklady Akademii Nauk},
     pages = {305--310},
     year = {1982},
     volume = {267},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_267_2_a11/}
}
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