@article{IM2_2018_82_6_a1,
     author = {R. R. Gadyl'shin and A. L. Piatnitski and G. A. Chechkin},
     title = {On the asymptotic behaviour of eigenvalues of a~boundary-value problem
},
     journal = {Izvestiya. Mathematics },
     pages = {1108--1135},
     publisher = {mathdoc},
     volume = {82},
     number = {6},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2018_82_6_a1/}
}