@article{VMUMM_1988_1_a29,
     author = {A. S. Popeluhin},
     title = {Necessary conditions for the local solvability of a class of pseudodifferential operators with double involutive characteristics},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {98--100},
     publisher = {mathdoc},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_1_a29/}
}