@article{FPM_2000_6_4_a7,
     author = {V. V. Dubrovskii and A. I. Sedov},
     title = {Estimation of the~difference of spectral functions of {the~Legendre-type} operators},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {1075--1082},
     publisher = {mathdoc},
     volume = {6},
     number = {4},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2000_6_4_a7/}
}