@article{AUCMP_2004__45_1_a2,
     author = {Mor\'avek, Z. and Fiala, J.},
     title = {The period of oscillations in non-linear systems},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {9--16},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {2004},
     mrnumber = {2109689},
     zbl = {1097.34528},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_2004__45_1_a2/}
}