Geodesic
The leading term of the spectral asymptotics for the Kohn--Laplace operator in a bounded domain
Matematičeskie zametki, Tome 64 (1998) no. 4, pp. 493-505

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We prove the Weyl asymptotic formula for the number of eigenvalues of the Kohn–Laplace operator on a Heisenberg group and write out the leading term of asymptotics. The method of study is based on estimates of the Green function for the Dirichlet problem for the corresponding parabolic operator and makes use of the classical Hardy–Littlewood Tauberian theorem. 
@article{MZM_1998_64_4_a1,
     author = {Yu. A. Alkhutov and V. V. Zhikov},
     title = {The leading term of the spectral asymptotics for the {Kohn--Laplace} operator in a bounded domain},
     journal = {Matemati\v{c}eskie zametki},
     pages = {493--505},
     publisher = {mathdoc},
     volume = {64},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_4_a1/}
}
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Yu. A. Alkhutov; V. V. Zhikov. The leading term of the spectral asymptotics for the Kohn--Laplace operator in a bounded domain. Matematičeskie zametki, Tome 64 (1998) no. 4, pp. 493-505. http://geodesic.mathdoc.fr/item/MZM_1998_64_4_a1/