@article{RM_1986_41_6_a22,
     author = {A. N. Kolmogorov and A. A. Mal'tsev and S. P. Novikov},
     title = {Kirill {Aleksandrovich} {Sitnikov} (on~his sixtieth birthday)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {251--253},
     publisher = {mathdoc},
     volume = {41},
     number = {6},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1986_41_6_a22/}
}