@article{SEMR_2021_18_2_a77,
     author = {M. V. Tryamkin},
     title = {The length and area principle for a function on an abstract surface over a domain of a {Carnot} group},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {1720--1734},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2021_18_2_a77/}
}