@article{MZM_1990_48_3_a1,
     author = {A. A. Borisenko and Yu. A. Nikolaevskii},
     title = {Surfaces with maximal curvature of the {Grassmann} image},
     journal = {Matemati\v{c}eskie zametki},
     pages = {12--19},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_3_a1/}
}