@article{MZM_2011_89_5_a13,
     author = {A. A. Borisenko and E. V. Petrov},
     title = {Surfaces in the {Three-Dimensional} {Heisenberg} {Group} on {Which} the {Gauss} {Map} {Has} {Bounded} {Jacobian}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {794--796},
     publisher = {mathdoc},
     volume = {89},
     number = {5},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_89_5_a13/}
}