@article{DAN_1964_159_4_a4,
     author = {M. L. Gorbachuk},
     title = {A description of the continuation of positive definite kernels},
     journal = {Doklady Akademii Nauk},
     pages = {719--722},
     publisher = {mathdoc},
     volume = {159},
     number = {4},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_4_a4/}
}