@article{PMFA_1972_17_6_a4,
     author = {Eckertov\'a, Ludmila},
     title = {Tenk\'e vrstvy},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {323--330},
     year = {1972},
     volume = {17},
     number = {6},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1972_17_6_a4/}
}