Skycorr: A general tool for spectroscopic sky subtractionS. Noll, W. Kausch, S. Kimeswenger, M. Barden, A. M. Jones, A. Modigliani, C. Szyszka and J. TaylorA&A, 567 (2014) A25DOI: https://doi.org/10.1051/0004-6361/201423908