@article{DAN_1990_311_1_a10,
     author = {V. I. Bujakas},
     title = {Multi-mirror controllable surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {54--58},
     publisher = {mathdoc},
     volume = {311},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a10/}
}