openSAP: Evaluating xMOOC Usage and Challenges for Scalable and Open Enterprise Education.Published in:International Journal of Advanced Corporate Learning, 2016, v. 9, n. 2, p. 34, doi. 10.3991/ijac.v9i2.6008By:Renz, Jan;Schwerer, Florian;Meinel, ChristophPublication type:Article