@incollection{JEDP_2024____A7_0,
     author = { Frank, Rupert L. and Helffer, Bernard},
     title = {On {Courant} and {Pleijel} theorems for {sub-Riemannian} {Laplacians}},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     note = {talk:7},
     pages = {1--12},
     year = {2024},
     publisher = {R\'eseau th\'ematique AEDP du CNRS},
     doi = {10.5802/jedp.688},
     language = {en},
     url = {https://www.numdam.org/articles/10.5802/jedp.688/}
}