1. [1] Albin, Pierre; Leichtnam, Éric; Mazzeo, Rafe; Piazza, Paolo The signature package on Witt spaces, Ann. Sci. Éc. Norm. Supér. (4), Tome 45 (2012) no. 2, pp. 241-310
2. [2] Ammann, B.; Lauter, R.; Nistor, V. Pseudodifferential operators on manifolds with Lie structure at infinity, Annals of Mathematics, Tome 165 (2007), pp. 717-747
3. [3] Anantharaman-Delaroche, C.; Renault, J. Amenable groupoids, L’Enseignement Mathématique (2000) (Volume 36 of Monographies de L’Enseignement Mathématique)
4. [4] Androulidakis, Iakovos; Skandalis, Georges The holonomy groupoid of a singular foliation, J. Reine Angew. Math., Tome 626 (2009), pp. 1-37
5. [5] Androulidakis, Iakovos; Skandalis, Georges The analytic index of elliptic pseudodifferential operators on a singular foliation, J. K-Theory, Tome 8 (2011) no. 3, pp. 363-385