@article{ZNSL_1981_112_a11,
     author = {Kh. N. Narzullaev},
     title = {Isolation theorems for {DOTU} matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {159--166},
     publisher = {mathdoc},
     volume = {112},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_112_a11/}
}