@article{TSG_2006-2007__25__41_0,
     author = {Boscain, Ugo and Sigalotti, Mario},
     title = {High-order angles in {almost-Riemannian} geometry},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {41--54},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {25},
     year = {2006-2007},
     doi = {10.5802/tsg.246},
     zbl = {1159.53320},
     mrnumber = {2478807},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/tsg.246/}
}