1. and , The index problem for manifolds with boundary, in: Proceedings of the Colloquium on Differential Analysis, Tata Institute Bombay, Bombay 1964 (Oxford University Press, Oxford, 1964), pp. 175–186.
2. K -Theory (Harvard University, Cambridge Mass., 1965).
3. Spectral asymmetry and Riemannian Geometry. I
4. Spectral asymmetry and Riemannian geometry. II