Quantum gravity: unification of principles and interactions, and promises of spectral geometry. Booss-Bavnbek, Bernhelm, Esposito, Giampiero, Lesch, Matthias (2007) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Quillen metrics and higher analytic torsion forms. Jean-Michel Bismut, Alain Berthomieu (1994) Journal für die reine und angewandte Mathematik