@misc{prange_principles_and_1994, 
author={Prange, A.},
title={Principles and applications of TXRF for trace element analysis: State of the art},
year={1994},
howpublished = {conference lecture (invited): Gaithersburg, MD (USA); 24.02.1994},
note = {Online available at: \url{} (DOI). Prange, A.: Principles and applications of TXRF for trace element analysis: State of the art. National Institute of Standards and Technology (NIST). Gaithersburg, MD (USA), 1994.}}