@article{MZM_2012_92_6_a8,
     author = {V. A. Krasnov},
     title = {Real {Four-Dimensional} $M${-Triquadrics}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {884--892},
     publisher = {mathdoc},
     volume = {92},
     number = {6},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2012_92_6_a8/}
}