Hatzipanagos, StylianosKnop, Jan vonSchirmbacher, PeterMahnic, Viljan2019-11-282019-11-2820013-88579-339-3https://dl.gi.de/handle/20.500.12116/30557enWeb based learning and "off-the-shelf" software: towards a typology of VLE interfacesText/Conference Paper1617-5468