@article{DE_2005_41_3_a1,
     author = {B. A. Babajanov and A. B. Khasanov and A. B. Yakhshimuratov},
     title = {On the {Inverse} {Problem} for a {Quadratic} {Pencil} of {Sturm--Liouville} {Operators} with {Periodic} {Potential}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {298--305},
     publisher = {mathdoc},
     volume = {41},
     number = {3},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_3_a1/}
}