1. M. Aigner and G. M. Ziegler, “Representing numbers as sums of two squares,” in Proofs from THE BOOK (Springer, Berlin, 2018), Ch. 4, pp. 19–26.
2. N. Alon, “Tools from higher algebra,” in Handbook of Combinatorics, Ed. by R. L. Graham, M. Grötschel, and L. Lovász (Elsevier, Amsterdam, 1995), Vol. 2, pp. 1749–1783.
3. A. Brauer and R. Reynolds, “On a theorem of Aubry–Thue,” Can. J. Math. 3, 367–374 (1951).
4. D. Di Benedetto, J. Solymosi, and E. White, “On the directions determined by a Cartesian product in an affine Galois plane,” arXiv: 2001.06994 [math.CO].
5. B. Hanson and G. Petridis, “Refined estimates concerning sumsets contained in the roots of unity,” Proc. London Math. Soc. 122 (3), 353–358 (2021); arXiv: 1905.09134 [math.NT].