@article{KUTGS_1990_20_a11,
     author = {V. V. Shurygin},
     title = {Projectable geometric objects on the $\mathbb A$-jet bundle},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {120--126},
     publisher = {mathdoc},
     volume = {20},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1990_20_a11/}
}