@misc{wilken_mercury_problems_1993, 
author={Wilken, R.-D.},
title={Mercury problems in Germany and the analytical approach},
year={1993},
howpublished = {conference lecture: Toronto (CDN);},
note = {Wilken, R.: Mercury problems in Germany and the analytical approach. In: International Conference on Heavy Metals in the Environment. Toronto (CDN). 1993. 372-375.}}