@article{SM_1995_81_2_a4,
     author = {S. G. Pyatkov},
     title = {Riesz completeness of the~eigenelements and associated elements of linear selfadjoint pencils},
     journal = {Sbornik. Mathematics},
     pages = {343--361},
     publisher = {mathdoc},
     volume = {81},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_81_2_a4/}
}