Christophe, Sidonie, and Charlotte Hoarau. “Expressive Map Design Based on Pop Art: Revisit of Semiology of Graphics?”. Cartographic Perspectives0, no. 73 (September 1, 2012): 61-74. Accessed October 24, 2021. https://cartographicperspectives.org/index.php/journal/article/view/cp73-christophehoarau.