@article{VTPMK_2022_3_a3,
     author = {O. N. Ul'yanov and L. I. Rubina},
     title = {On irrotational vector fields with vector lines located on a given surface},
     journal = {Vestnik Tverskogo gosudarstvennogo universiteta. Seri\^a Prikladna\^a matematika},
     pages = {49--61},
     year = {2022},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTPMK_2022_3_a3/}
}