@article{DAN_1960_133_2_a23,
     author = {Yu. G. Ryzhkov},
     title = {The recorded integral heat values of solar radiation between $64^\circ$ s. lat, and $60^\circ$ n. lat.},
     journal = {Doklady Akademii Nauk},
     pages = {352--354},
     publisher = {mathdoc},
     volume = {133},
     number = {2},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_2_a23/}
}