@misc{follner_reproduction_of_2004, 
author={Follner, S., follner, H., Guenther, A.},
title={Reproduction of historical gypsum mortar},
year={2004},
howpublished = {journal article},
note = {Follner, S.; follner, H.; Guenther, A.: Reproduction of historical gypsum mortar. Cement International. 2004. vol. 3, 96-109.}}