Rupam Baruah, Shyamanta M Hazarika. Qualitative Directions in Egocentric and Allocentric Spatial Reference Frames. ijcisim [Internet]. 2014 Apr. 1 [cited 2024 Jul. 3];6:11. Available from: https://cspub-ijcisim.org/index.php/ijcisim/article/view/262