@article{RM_1996_51_6_a18,
     author = {V. V. Pod'yapol'skii and A. L. Skubachevskii},
     title = {On the completeness and basis property for a~system of root functions of strongly elliptic functional-differential operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1220--1222},
     publisher = {mathdoc},
     volume = {51},
     number = {6},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1996_51_6_a18/}
}