@article{SM_1969_9_2_a4,
     author = {Yu. A. Aminov},
     title = {Sources of curvature of a~vector field},
     journal = {Sbornik. Mathematics},
     pages = {199--211},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1969_9_2_a4/}
}