The hadronic interaction model Sibyll 2.3c and muon production in extensive air-showers Felix Riehn, Ralph Engel, Anatoli Fedynitch, Thomas K. Gaisser and Todor Stanev EPJ Web Conf., 208 (2019) 11002 Published online: 10 May 2019 DOI: 10.1051/epjconf/201920811002