@article{10_21136_CPMF_1938_124082,
     author = {Kopal, Zden\v{e}k},
     title = {The orbits about an oblate spheroid},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {67--75},
     publisher = {mathdoc},
     volume = {67},
     number = {1},
     year = {1938},
     doi = {10.21136/CPMF.1938.124082},
     zbl = {0017.38102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1938.124082/}
}