@article{RM_1978_33_4_a2,
     author = {V. F. Kovalenko and Yu. A. Semenov},
     title = {Some problems on expansion in generalized eigenfunctions of the
},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {119--157},
     publisher = {mathdoc},
     volume = {33},
     number = {4},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1978_33_4_a2/}
}