@article{MZ_1929__30_168125,
     author = {P. Franklin},
     title = {Almost periodic recurrent motions},
     journal = {Mathematische Zeitschrift},
     pages = {325--331},
     publisher = {mathdoc},
     volume = {30},
     year = {1929},
     zbl = {55.1094.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__30_168125/}
}