@article{DAN_1970_191_4_a19,
     author = {K. Ya. Kondrat'ev and A. P. Galtsev and O. I. Smoktiy and E. V. Khrunov},
     title = {Visual colour estimates of twilight sky according to observations from the spacecraft {``Soyuz-5''}},
     journal = {Doklady Akademii Nauk},
     pages = {824--825},
     publisher = {mathdoc},
     volume = {191},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_191_4_a19/}
}