@article{EMJ_2011_2_3_a3,
     author = {Kh. K. Ishkin},
     title = {On continuity of the spectrum of a~singular quasi-differential operator with respect to a~parameter},
     journal = {Eurasian mathematical journal},
     pages = {67--81},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2011_2_3_a3/}
}