Geodesic
Fourth-order hypoelliptic pseudodifferential operators with a noninvolutive characteristic set
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1990), pp. 71-73 
Nguen Min' Chi. Fourth-order hypoelliptic pseudodifferential operators with a noninvolutive characteristic set. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (1990), pp. 71-73. http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a17/
@article{VMUMM_1990_2_a17,
     author = {Nguen Min' Chi},
     title = {Fourth-order hypoelliptic pseudodifferential operators with a noninvolutive characteristic set},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {71--73},
     year = {1990},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a17/}
}
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