@article{10_4064__27_2_373_382,
     author = {S. Pyatkov},
     title = {Some properties of eigenfunctions of linear pencils and applications to mixed type operator-differential equations},
     journal = {Banach Center Publications},
     pages = {373--382},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1992},
     doi = {10.4064/-27-2-373-382},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/-27-2-373-382/}
}