@article{MZM_1992_51_1_a16,
     author = {S. G. Pyatkov},
     title = {Certain properties of eigenfunctions of linear pencils},
     journal = {Matemati\v{c}eskie zametki},
     pages = {141--148},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_1_a16/}
}