@article{RM_1978_33_6_a20,
     author = {N. S. Nadirashvili},
     title = {On~a~Phragmen--Lindel\"of theorem for~a~certain class of~elliptic equations of~high order},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {251},
     publisher = {mathdoc},
     volume = {33},
     number = {6},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1978_33_6_a20/}
}