Ballmann, Werner; Brüning, Jochen; Carron, Gilles Regularity and index theory for Dirac-Schrödinger systems with Lipschitz coefficients. (English) Zbl 1145.35353 J. Math. Pures Appl. (9) 89, No. 5, 429-476 (2008). MSC: 35B65 35F15 58J32 47A53 PDFBibTeX XMLCite \textit{W. Ballmann} et al., J. Math. Pures Appl. (9) 89, No. 5, 429--476 (2008; Zbl 1145.35353) Full Text: DOI arXiv
Ballmann, Werner; Brüning, Jochen On the spectral theory of manifolds with cusps. (English) Zbl 1049.58026 J. Math. Pures Appl., IX. Sér. 80, No. 6, 593-625 (2001). Reviewer: Ilka Agricola (Berlin) MSC: 58J50 53C20 58J20 53C21 58J28 PDFBibTeX XMLCite \textit{W. Ballmann} and \textit{J. Brüning}, J. Math. Pures Appl. (9) 80, No. 6, 593--625 (2001; Zbl 1049.58026) Full Text: DOI