@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},
     publisher = {mathdoc},
     volume = {4},
     number = {5},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_5_a8/}
}