@article{IM2_1970_4_5_a8,
     author = {M. Sh. Birman and M. Z. Solomyak},
     title = {Asymptotic behavior of the spectrum of weakly polar integral},
     journal = {Izvestiya. Mathematics},
     pages = {1151--1168},
     year = {1970},
     volume = {4},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_5_a8/}
}