F.  Aprin, Manske, S., and H. Hoppe, U., ?SALMON: Sharing, Annotating and Linking Learning Materials Online?, in Lecture Notes in Computer Science, Springer International Publishing, 2019, pp. 250?257.

S. N.  Mwendia, Manske, S., and Hoppe, H. U., ?Supporting E-learning in computer-poor environments by combining OER, cloud services and mobile learning?, Proceedings of the 22nd International Conference on Computers in Education, ICCE 2014, pp. 545-550, 2014.

A.  Giemza, Manske, S., and Hoppe, H. U., ?Supporting the formation of informal learning groups in a heterogeneous information environment?, Proceedings of the 21st International Conference on Computers in Education, ICCE 2013, pp. 367-374, 2013.