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@article{CMH_1932__4_138571, author = {Harald Bohr}, title = {Ueber fastperiodische ebene {Bewegungen.}}, journal = {Commentarii mathematici Helvetici}, pages = {51--64}, publisher = {mathdoc}, volume = {4}, year = {1932}, zbl = {0005.06304}, url = {http://geodesic.mathdoc.fr/item/CMH_1932__4_138571/} }
Harald Bohr. Ueber fastperiodische ebene Bewegungen.. Commentarii mathematici Helvetici, Tome 4 (1932), pp. 51-64. http://geodesic.mathdoc.fr/item/CMH_1932__4_138571/