@misc{dahms_series_expansion_1994, 
author={Dahms, M.},
title={Series expansion and positivity},
year={1994},
howpublished = {conference lecture: Clausthal-Zellerfeld (D);},
note = {Dahms, M.: Series expansion and positivity. In: Bunge, H. (Ed.): Proceedings of the 10th International Conference on Textures of Materials ICOTOM-10. Clausthal-Zellerfeld (D). 1994. 341-347.}}