Khudheair Abbas Delly, AdilSaadiFadhil Al Saadi, and WisamJasim Hussein Banana. “CONCEPT OF FIGURE AND GROUND IN ARABIC CALLIGRAPHY, THE KUFIC SQUARE MODEL”. PalArch’s Journal of Archaeology of Egypt / Egyptology, vol. 17, no. 10, Dec. 2020, pp. 641-53, https://archives.palarch.nl/index.php/jae/article/view/4434.