Mekonnen, Abreham, and Em M. Pijl. “Spatial Analysis of Discarded Needles and Dropbox Locations in Calgary, Canada”. Canadian Journal of Urban Research 31, no. 1 (December 21, 2022): 1–15. Accessed June 9, 2026. https://cjur.uwinnipeg.ca/index.php/cjur/article/view/387.