@article{10_4064_ap_17_2_219_222,
     author = {E. Siwek},
     title = {Sur la d\'eriv\'ee covariante des pseudoobjets g\'eom\'etriques},
     journal = {Annales Polonici Mathematici},
     pages = {219--222},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1965},
     doi = {10.4064/ap-17-2-219-222},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-17-2-219-222/}
}