Koeny, M., Blanik, N., Yu, X., Czaplik, M., Walter, M., Rossaint, R., Blazek, V. and Leonhardt, S. (2014) “USING PHOTOPLETHYSMOGRAPHY IMAGING FOR OBJECTIVE CONTACTLESS PAIN ASSESSMENT”, Acta Polytechnica, 54(4), pp. 275–280. doi: 10.14311/AP.2014.54.0275.