K. Lüdge, and E. Schöll. Proc. 28th Int. Conference on Physics of Semiconductors (ICPS-28), Vienna 2006, volume 893 of AIP Conf. Proc., page 835--834. New York, Melville, (2007)
M. Meixner, P. Rodin, E. Schöll, and A. Wacker. Proceedings of the $7^th$ International Symposium on Nanostructure: Physics and Technology, page 280--283. St. Petersburg, Ioffe Institute, (1999)
G. Kießlich, A. Wacker, and E. Schöll. phys.~status solidi (b), (2002)Excitons and Many-Particle Effects in Semiconductors and Semiconductor Nanostructures (ed. E. Runge and May), in honour of the 60th birthday of R. Zimmermann.