TY - RPRT TI - The Updated Umkehr Ozone Retrieval Algorithm and its Validation against Satellite Data AU - Petropavlovskikh, I. AU - Bhartia, P. K. AU - Labow, G. AU - Wellemeyer, C. PY - 2003 UR - https://ntrs.nasa.gov/citations/20030112967 ID - 20030112967 ER -