@article {Manske2014, title = {A flexible and extendable learning analytics infrastructure}, journal = {Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)}, volume = {8613 LNCS}, year = {2014}, pages = {123-132}, author = {Tobias Hecking and Sven Manske and Bollen, L. and Govaerts, S. and Vozniuk, A. and H.Ulrich Hoppe} }