@article{DAN_1965_162_3_a4,
     author = {A. A. Kirillov},
     title = {Positive-definite functions on a group of matrices with elements from a discrete field},
     journal = {Doklady Akademii Nauk},
     pages = {503--505},
     publisher = {mathdoc},
     volume = {162},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_162_3_a4/}
}