@article{DAN_1967_172_4_a17,
     author = {E. S. Mashkova and V. A. Molchanov},
     title = {Multiple collisions in the scattering of ions by crystals},
     journal = {Doklady Akademii Nauk},
     pages = {813--816},
     publisher = {mathdoc},
     volume = {172},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_4_a17/}
}