ZaiontsYu., KorenkovM. E., and KharkevychYu. I. 2015. “On the Asymptotics of Some Weierstrass Functions”. Ukrains’kyi Matematychnyi Zhurnal 67 (1), 135–138. https://umj.imath.kiev.ua/index.php/umj/article/view/1968.