@article{JRAM_1882__93_148509,
     author = {O. B\"oklen},
     title = {Ueber die {Aufh\"angpunkte} und {Axen} f\"ur isochrone {Schwingungen} eines {K\"orpers.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {177--183},
     publisher = {mathdoc},
     volume = {93},
     year = {1882},
     zbl = {14.0757.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1882__93_148509/}
}