@article{MZM_2004_75_4_a1,
     author = {A. M. Akhtyamov},
     title = {On {Coefficients} of {Eigenfunction} {Expansions} for {Boundary-Value} {Problems} with {Parameter} in {Boundary} {Conditions}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {493--506},
     year = {2004},
     volume = {75},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_75_4_a1/}
}