@article{JMAG_2005_12_1_a4,
     author = {A. L. Piven},
     title = {Condition of completeness of elementary solutions for degenerate higher order operator differential equations},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {86--102},
     year = {2005},
     volume = {12},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2005_12_1_a4/}
}