@misc{wilken_rapid_methods_1991, 
author={Wilken, R.-D., Joshi, S.},
title={Rapid methods for determining 90-Sr, 89-Sr und 90-Y in environmental samples: a survey},
year={1991},
howpublished = {GKSS report},
note = {Wilken, R.; Joshi, S.: Rapid methods for determining 90-Sr, 89-Sr und 90-Y in environmental samples: a survey. Radioactivity & Radiochemistry. 1991. vol. 2, no. 3, 14-27.}}