@inbook {bollen_flexible_2008,
	title = {Flexible analysis of user actions in heterogeneous distributed learning environments},
	booktitle = {Times of Convergence. Technologies Across Learning Contexts},
	year = {2008},
	note = {00016},
	publisher = {Springer},
	organization = {Springer},
	author = {Bollen, Lars and Adam Giemza and H. Ulrich Hoppe}
}
