M.  Wenig, Kuhl, S., Beirle, S., Bucsela, E., Jähne, B., Platt, U., Gleason, J., and Wagner, T., ?Retrieval and analysis of stratospheric NO$_2$ from the Global Ozone Monitoring Experiment?, J. Geophys. Res., vol. 109, p. D04315, 1--11, 2004.

C.  Leue, Wenig, M., Platt, U., Jähne, B., Geißler, P., and Haußecker, H., ?Retrieval of Atmospheric Trace Gas Concentrations?, Handbook of Computer Vision and Applications, vol. 3: Systems and Applications. Academic Press, pp. 783-805, 1999.