1. Agricola, I.: The Srni lectures on non-integrable geometries with torsion. Arch. Math. Brno 42, 5–84 (2006)
2. Agricola, I., Becker-Bender, J., Kim, H.: Twistorial eigenvalue estimates for generalized Dirac operators with torsion. Adv. Math. 243, 296–329 (2013)
3. Agricola, I., Friedrich, Th., Kassuba, M.: Eigenvalue estimates for Dirac operators with parallel characteristic torsion. Differ. Geom. Appl. 26, 613–624 (2008)
4. Atiyah, M.F., Patodi, V.K., Singer, I.M.: Spectral asymmetry and Riemannian geometry I. Math. Proc. Camb. Philos. Soc. 77, 43–69 (1975)
5. Baum, H., Friedrich, Th., Grunewald, R., Kath, I.: Twistors and Killing Spinors on Riemannian Manifolds. Teubner, Leipzig (1991)