Saadatmand, Mohsen, and Kristiina Kumpulainen. 2013. “Content Aggregation and Knowledge Sharing in a Personal Learning Environment: Serendipity in Open Online Networks”. International Journal of Emerging Technologies in Learning (iJET) 8 (S1):pp. 70-78. https://doi.org/10.3991/ijet.v8iS1.2362.