1. Schinzel A., “Around Pólya’s theorem on the set of prime divisors of a linear recurrence” in:, Diophantine Equations. Papers from the International Conference Held in Honor of T. N. Shorey’s
60th Birthday, Mumbai, 16–20 December 2005 (N. Saradha, ed.), Narosa, New Delhi (2008), 225–233.
2. Dubickas A., “Roots of unity as quotients of two conjugate algebraic numbers,” Glas. Mat. Ser. III, vol. 52(72), no. 2, 235–240 (2017).
3. Isaacs I. M., “Quotients which are roots of unity (solution of problem $ 6523 $),” Amer. Math. Monthly, vol. 95, no. 6, 561–562 (1988).
4. Aschbacher M. G. and Guralnick R. M., “On Abelian quotients of primitive groups,” Proc. Amer. Math. Soc., vol. 107, no. 1, 89–95 (1989).
5. Drungilas P. and Dubickas A., “On subfields of a field generated by two conjugate algebraic numbers,” Proc. Edinb. Math. Soc. (2), vol. 47, no. 1, 119–123 (2004).