Vasileios Athanasios Anagnostopoulos Michal Havlena Peter Kiefer Ioannis Giannopoulos Konrad Schindler Martin Raubal Gaze-Informed location-based services. 1770-1797 2017 31 Int. J. Geogr. Inf. Sci. 9 https://doi.org/10.1080/13658816.2017.1334896 db/journals/gis/gis31.html#Anagnostopoulos17