Pavlova D. Conceptual Model of a Mobile Application for Educational Purposes to Help Preserve the Country’s Historical Heritage and Promote the Cultural Identity of the Nation. DiPP [Internet]. 2019 Sep. 13 [cited 2024 Apr. 27];9:295-302. Available from: https://dipp.math.bas.bg/dipp/article/view/dipp.2019.9.30