1. I. A. Baburin, M. Bouniaev, N. Dolbilin, N. Yu. Erokhovets, A. Garber, S. V. Krivovichev, and E. Schulte, “On the origin of crystallinity: A lower bound for the regularity radius of Delone sets,” Acta Crystallogr., Sect. A 74 (6), 616–629 (2018).
2. B. Delaunay, “Sur la sphère vide: A la mémoire de Georges Voronoï,” Izv. Akad. Nauk SSSR, Otd. Mat. Estestv. Nauk, No. 6, 793–800 (1934).
3. B. N. Delone, “Geometry of positive quadratic forms,” Usp. Mat. Nauk, No. 3, 16–62 (1937).
4. B. N. Delone, N. P. Dolbilin, and M. I. Shtogrin, “Combinatorial and metric theory of planigons,” Proc. Steklov Inst. Math. 148, 111–141 (1980) [transl. from Tr. Mat. Inst. Steklova 148, 109–140 (1978)].
5. B. N. Delone, N. P. Dolbilin, M. I. Shtogrin, and R. V. Galiulin, “A local criterion for regularity of a system of points,” Sov. Math., Dokl. 17 (2), 319–322 (1976) [transl. from Dokl. Akad. Nauk SSSR 227 (1), 19–21 (1976)].