@article{VUU_2005_1_a4,
     author = {M. A. Klochkov},
     title = {Estimations of one rank perturbations' norm},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {75--90},
     year = {2005},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2005_1_a4/}
}