@misc{pereiranunes_membranes_for_2002, 
author={Pereira Nunes, S.},
title={Membranes for fuel cell},
year={2002},
howpublished = {conference lecture (invited): Berlin (D);},
note = {Pereira Nunes, S.: Membranes for fuel cell. Vortrag am Hahn-Meitner-Institut. Berlin (D), 2002.}}