@misc{paul_introduction_in_1993, 
author={Paul, D.},
title={Introduction in membrane technology},
year={1993},
howpublished = {conference lecture (invited): Krems (A); 16.-23. Oktober 1993},
note = {Online available at: \url{} (DOI). Paul, D.: Introduction in membrane technology. Intensive Course on Blood Material Interaction. Krems (A), 1993.}}