@article{ZNSL_1974_45_a4,
     author = {V. G. Dmitriev},
     title = {On submanifolds with everywhere semidefinite second fundamental form},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {68--70},
     publisher = {mathdoc},
     volume = {45},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_45_a4/}
}