Popovych, R. B. “Sharpening of the Explicit Lower Bounds for the Order of Elements in Finite Field Extensions Based on Cyclotomic Polynomials”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 66, no. 6, June 2014, pp. 815–825, http://umj.imath.kiev.ua/index.php/umj/article/view/2179.