Clouds in the atmospheres of extrasolar planets - III. Impact of low and high-level clouds on the reflection spectra of Earth-like planetsD. Kitzmann, A. B. C. Patzer, P. von Paris, M. Godolt and H. RauerA&A, 534 (2011) A63DOI: https://doi.org/10.1051/0004-6361/201117375