Gavalyugov, Veselin and Tamakyarska, Denita and Ranusawud, Monludee and Tonmueanwai, Anusorn and Hong, Feng-Lei and Ishikawa, Jun and Moona, Girija and Sharma, Rina and Hapiddin, Asep and Boynawan, Ahmad Mohamad and Alqahtani, Nasser and Alfohaid, Mohammad and Robertsson, Lennart (2016) Report on on-going CCL Key Comparison for the year 2015 Comparison of optical frequency and wavelength standards CCL-K11 Final. Technical Report. Bundesamt für Eich- und Vermessungswesen (BEV) Vienna, Austria.