@article{MZM_1989_46_3_a1,
     author = {A. A. Borisenko},
     title = {Surfaces with {Chern--Lashof} absolute curvature equal to the area of the {Grassman} image},
     journal = {Matemati\v{c}eskie zametki},
     pages = {9--11},
     publisher = {mathdoc},
     volume = {46},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1989_46_3_a1/}
}