@article{MZM_1999_66_2_a0,
     author = {J. Ben Amara and A. A. Shkalikov},
     title = {A {Sturm--Liouville} problem with physical and spectral parameters in boundary conditions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {163--172},
     publisher = {mathdoc},
     volume = {66},
     number = {2},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_2_a0/}
}