Medien in der Wissenschaft, Bd. 46: E-Strategy Stratmann Jörg Kerres Michael e-learning higher education 370 periodical academic journal eleed 5 1 2009 1860-7470 urn:nbn:de:0009-5-19477 http://nbn-resolving.de/urn:nbn:de:0009-5-19477 stratmann2009