The hypoelliptic Dirac operator. Bismut, J. In Geometry and dynamics of groups and spaces, pages 113–246. Springer, 2007.
bibtex   
@incollection{bismut_hypoelliptic_2007,
	title = {The hypoelliptic {Dirac} operator},
	booktitle = {Geometry and dynamics of groups and spaces},
	publisher = {Springer},
	author = {Bismut, Jean-Michel},
	year = {2007},
	pages = {113--246},
}

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