@article{INTM_1985_23_a1,
     author = {V. P. Glushko and Yu. B. Savchenko},
     title = {Higher-order degenerate elliptic equations: spaces, operators and boundary value problems},
     journal = {Itogi nauki i tehniki. Seri\^a, Matemati\v{c}eskij analiz},
     pages = {125--218},
     year = {1985},
     volume = {23},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTM_1985_23_a1/}
}