@article{10_4064_ap_29_1_61_66,
     author = {H. Kaczy\'nski and C. Olech},
     title = {Existence of solutions of orientor fields
with non-convex right-hand side},
     journal = {Annales Polonici Mathematici},
     pages = {61--66},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1974},
     doi = {10.4064/ap-29-1-61-66},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-29-1-61-66/}
}