@article{ZNSL_1976_58_a7,
     author = {T. Ya. Kon'kova and V. N. Kublanovskaya},
     title = {Two-sided approximations in the $LR$-algorithm},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {67--71},
     year = {1976},
     volume = {58},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_58_a7/}
}