@conference {5689,
	title = {Provisioning strong and weak OER: Requirements of open informational Ecosystems},
	booktitle = {Open Education Global Conference 2015},
	year = {2015},
	address = {Banff, Alberta, Canada },
	url = {https://www.researchgate.net/publication/280317907_Provisioning_strong_and_weak_OER_Requirements_of_open_informational_Ecosystems},
	author = {Heinen, Richard and Michael Kerres and Ingo Blees and Rittberger, Marc}
}
