@misc{guenther_ers1_radar_1992, 
author={Guenther, H.},
title={ERS-1 radar altimeter, calibration and validation},
year={1992},
howpublished = {conference lecture: Sintra (P);},
note = {Guenther, H.: ERS-1 radar altimeter, calibration and validation. 10th WAM Meeting. Sintra (P), 1992.}}