@article{AIF_1981__31_4_115_0,
     author = {Mauceri, Giancarlo},
     title = {Riesz means for the eigenfunction expansions for a class of hypo-elliptic differential operators},
     journal = {Annales de l'Institut Fourier},
     pages = {115--140},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {31},
     number = {4},
     year = {1981},
     doi = {10.5802/aif.851},
     mrnumber = {84h:35125},
     zbl = {0455.35039},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.851/}
}