@misc{stuhrmann_sans_with_1993, 
author={Stuhrmann, H. B.},
title={SANS with polarized neutrons},
year={1993},
howpublished = {GKSS report},
note = {Stuhrmann, H.: SANS with polarized neutrons. Physica Scripta. 1993. vol. 49, 644-649.}}