@article{IVM_2021_6_a2, author = {A. V. Kostin}, title = {Asymptotic lines on pseudospheres and the angle of parallelism}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {25--34}, publisher = {mathdoc}, number = {6}, year = {2021}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_2021_6_a2/} }