@misc{friedrich_a_high_1990, 
author={Friedrich, H., Wagner, V., Wille, P.},
title={A high performance neutron velocity selector},
year={1990},
howpublished = {conference lecture: Berlin (D);},
note = {Friedrich, H.; Wagner, V.; Wille, P.: A high performance neutron velocity selector. Verbundtreffen Forschung mit Neutronen. Berlin (D), 1990.}}