1. Conjugacy classes of small sizes in the linear and unitary groups;Burkett, Shawn T.;J. Group Theory,2013
2. [2] Conway, John H.; Curtis, Robert T.; Norton, Simon P.; Parker, Richard A.; Wilson, Robert A. Atlas of Finite Groups. Maximal subgroups and ordinary characters for simple groups, Clarendon Press, 1985 (with comput. assist. from J. G. Thackray)
3. [3] Dornhoff, Larry Group Representation Theory (in 2 parts). Part A: Ordinary representation theory, Pure and Applied Mathematics, 7, Marcel Dekker, 1971
4. A character theoretic condition for ;Gagola, Stephen M. jun.;Commun. Algebra,2005
5. [5] Gasarch, William; Washington, Larry ∑ p≤n 1/p=ln(lnn)+O(1) : An Exposition (2015) (https://arxiv.org/abs/1511.01823)