@article{PMFA_1956_1_1_a6,
     author = {Troickaja, V. A.},
     title = {Zemn{\'\i} proudy},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {50--55},
     year = {1956},
     volume = {1},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1956_1_1_a6/}
}