@article{IM2_2010_74_3_a0,
     author = {T. N. Harutyunyan},
     title = {The eigenvalue function of a family of {Sturm--Liouville} operators},
     journal = {Izvestiya. Mathematics },
     pages = {439--459},
     publisher = {mathdoc},
     volume = {74},
     number = {3},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2010_74_3_a0/}
}