@article{10_21136_MB_2001_134193,
     author = {Lichardov\'a, Hana},
     title = {The period of a~whirling pendulum},
     journal = {Mathematica Bohemica},
     pages = {593--606},
     publisher = {mathdoc},
     volume = {126},
     number = {3},
     year = {2001},
     doi = {10.21136/MB.2001.134193},
     mrnumber = {1970262},
     zbl = {0977.37027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2001.134193/}
}