@article{10_4064_ap_44_2_197_200,
     author = {Ronald A. Knight},
     title = {Central motions},
     journal = {Annales Polonici Mathematici},
     pages = {197--200},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {1984},
     doi = {10.4064/ap-44-2-197-200},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-44-2-197-200/}
}