@article{Krieter2022, author = {Krieter, Philipp}, title = {Are You Still There? An Exploratory Case Study on Estimating Students' LMS Online Time by Combining Log Files and Screen Recordings}, journal = {IEEE Transactions on Learning Technologies}, volume = {15}, number = {1}, pages = {55 -- 63}, doi = {10.1109/TLT.2022.3154828}, year = {2022}, }