Subelliptic estimates
Journées équations aux dérivées partielles (1981), article no. 3, 7 p. 
@article{JEDP_1981____A3_0,
     author = {Kohn, J. J.},
     title = {Subelliptic estimates},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {3},
     pages = {1--7},
     publisher = {Ecole polytechnique},
     year = {1981},
     zbl = {0487.35037},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1981____A3_0/}
}
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Kohn, J. J. Subelliptic estimates. Journées équations aux dérivées partielles (1981), article  no. 3, 7 p. http://archive.numdam.org/item/JEDP_1981____A3_0/

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[2] Kohn, J. J. : Subellipticity of the ∂-Neumann problem on pseudo convex domain : sufficient conditions, Acta Math. 142, 79-122 (1979). | MR | Zbl

[3] Hörmander, L. : Subelliptic operators, Annals of Math. Studies, n° 91, 127-208 (1979). | MR | Zbl