(with D. Bleecker), `Index Theory with Applications to Mathematics and Physics', kommer i International Publisher, Boston, 651 pp. Eprint: http://mmf.ruc.dk/~Booss/book/index.htm.

(with G. Grubb, K.P. Wojciechowski, eds.), `Spectral Geometry of Manifolds with Boundary and Decomposition of Manifolds - Proceedings of a Workshop, August 2003, Roskilde University, Denmark’, Am. Math. Soc. Series `Contemporary Mathematics’ vol. 366 (2005), 328 pp.

(with M. Lesch og J. Phillips) ’Unbounded Fredholm Operators and Spectral Flow', 26 pp, Eprint (arXiv): math.FA/0108014. In print for Canad. J. Math. vol. 57 (2005), http://www.journals.cms.math.ca/cgi-bin/vault/viewprepub/booss3342.prepub

(with C. Zhu), `Weak symplectic functional analysis and general spectral flow formula’, Eprint (arXiv): math.DG/0406139, 57 pp.

(with C. Zhu), `General spectral flow formula for fixed maximal domain’, 21 pp, to appear in Central European Journal of Mathematics.

(with M. Lesch og C. Zhu), `Basic analytic and topological properties of formally self-adjoint elliptic differential operators of first order on compact manifolds with smooth boundary’, Working Paper, 28 pp.