L 2 -index theorems, KK-theory, and connections. Schick, Thomas (2005) The New York Journal of Mathematics [electronic only]
L2 Riemannian-Roch Theorem for Elliptic Operators. M.A. Shubin (1995) Geometric and functional analysis
Le théorème de l'indice relatif L. Boutet de Monvel, B. Malgrange (1990) Annales scientifiques de l'École Normale Supérieure