Ekaterina Yu. Churakova, Vokhidov Ayubjon. “GEOMETRIC DEPENDENCE OF DETERMINING THE MAGNITUDE OF THE INACCURACY OF PENDULUM MECHANISMS”. PalArch’s Journal of Archaeology of Egypt Egyptology, vol. 17, no. 6, Nov. 2020, pp. 10861-9, https://www.archives.palarch.nl/index.php/jae/article/view/2779.