@article{JOLT_2019_29_3_a8,
     author = {T. Bruno},
     title = {Maximal {Hypoellipticity} for {Left-Invariant} {Differential} {Operators} on {Lie} {Groups}},
     journal = {Journal of Lie Theory},
     pages = {801--809},
     year = {2019},
     volume = {29},
     number = {3},
     doi = {10.5802/jolt.1079},
     zbl = {1423.35085},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.1079/}
}