C. Braun, M. Ebner, L. H. Fickert, and S. Schön, “The Online Course as Initial Stage of a Course in Higher Education: Implementation and Evaluation of the Pre-MOOC Concept in a Technical Degree Course”, Int. J. Emerg. Technol. Learn., vol. 16, no. 06, pp. pp. 245–258, Mar. 2021.