Kiefer, P., Giannopoulos, I., Göbel, F., Raubal, M., & Duchowski, A. T. (Eds.). (2018). Eye Tracking for Spatial Research, Proceedings of the 3rd International Workshop (ET4S): In conjunction with the 14th International Conference on Location Based Services (LBS 2018). ETH-Zürich. https://doi.org/10.3929/ethz-b-000222256