@article{MZM_2013_93_3_a14,
     author = {N. N. Pustovoitov},
     title = {On {Best} {Approximations} by {Analogs} of {``Proper''} and {``Improper''} {Hyperbolic} {Crosses}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {466--476},
     publisher = {mathdoc},
     volume = {93},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2013_93_3_a14/}
}