@article{VMUMM_1990_2_a13,
     author = {A. S. Popeluhin},
     title = {On the local nonsolvability of a class of pseudodifferential operators with multiple bicharacteristics},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {61--64},
     publisher = {mathdoc},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a13/}
}