On the local nonsolvability of a class of pseudodifferential operators with multiple bicharacteristics
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1990), pp. 61-64

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     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},
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     number = {2},
     year = {1990},
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     url = {http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a13/}
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A. S. Popeluhin. On the local nonsolvability of a class of pseudodifferential operators with multiple bicharacteristics. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1990), pp. 61-64. http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a13/