Non embeddable CR-structures
Journées équations aux dérivées partielles (1981), article no. 8, 8 p. 
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     author = {Fran\c{c}ois Tr\`eves},
     title = {Non embeddable {CR-structures}},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {8},
     pages = {1--8},
     publisher = {\'Ecole polytechnique},
     year = {1981},
     zbl = {0492.32024},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/item/JEDP_1981____A8_0/}
}
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François Trèves. Non embeddable CR-structures. Journées équations aux dérivées partielles (1981), article  no. 8, 8 p. https://proceedings.centre-mersenne.org/item/JEDP_1981____A8_0/

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