@article{friedrich_a_high_1989, 
author={Friedrich, H. and Wagner, V. and Wille, P.},
title={A high performance neutron velocity selector},
year={1989},
journal = {Physica  B},
volume = {156-157},
pages = {547-549},
note = {Friedrich, H.; Wagner, V.; Wille, P.: A high performance neutron velocity selector. In: Physica  B. Vol. 156-157 (1989)  547-549.}}