@misc{brockmann_the_use_1993, 
author={Brockmann, C.},
title={The use of the thematic mappers internal calibration sytem},
year={1993},
howpublished = {conference lecture: Frascati (I); 27.01.1993},
note = {Online available at: \url{} (DOI). Brockmann, C.: The use of the thematic mappers internal calibration sytem. Europaeische Weltraum Agentur ESA-ESRIN. Frascati (I), 1993.}}