@article{ZNSL_1977_74_a5,
     author = {O. V. Shalaevskii},
     title = {On an approximate procedure while fitting the observations with unknown weights},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {139--144},
     year = {1977},
     volume = {74},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1977_74_a5/}
}