@misc{wilken_three_years_1989, 
author={Wilken, R.-D.},
title={Three years after Chernobyl: a consideration of the „ecological half lives“ of Sr-90 and Cs-137 in the environment},
year={1989},
howpublished = {conference lecture: Karlsruhe (D); June 5-9, 1989},
note = {Online available at: \url{} (DOI). Wilken, R.: Three years after Chernobyl: a consideration of the „ecological half lives“ of Sr-90 and Cs-137 in the environment. Second Karlsruhe International Conference on Analytical Chemistry in Nuclear Technology. Karlsruhe (D), 1989.}}