@article{ZNSL_1979_91_a13,
     author = {Kh. N. Narzullaev},
     title = {On the neighborhood of the {DOTU} matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {171--179},
     publisher = {mathdoc},
     volume = {91},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_91_a13/}
}