@misc{wilken_strontium90_and_1989, 
author={Wilken, R.-D.},
title={Strontium-90 and Cesium-137 in the Elbe river (Germany) before and after the Chernobyl accident},
year={1989},
howpublished = {conference lecture: Burlington (CDN);},
note = {Wilken, R.: Strontium-90 and Cesium-137 in the Elbe river (Germany) before and after the Chernobyl accident. Canada Center for Inland Waters: CCIW Science Seminars. Burlington (CDN), 1989.}}