@misc{knoth_a_formula_1999, 
author={Knoth, J.,Prange, A.,Reus, U.,Schwenke, H.},
title={A formula for the background in TXRF as a function of the incidence angle and substrate material},
year={1999},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Knoth, J.; Prange, A.; Reus, U.; Schwenke, H.: A formula for the background in TXRF as a function of the incidence angle and substrate material. Spectrochimica Acta  B. 1999. vol. 54, 1513-1515.}}