1. B. Delaunay, “Sur la sphere vide,” Izv. Akad. Nauk SSSR Otd. Mat. Estestv. Nauk 6, 793–800 (1934).
2. B. N. Delone, “Geometry of positive quadratic forms I,” Usp. Mat. Nauk 3, 16–62 (1937).
3. B. N. Delone, “Geometry of positive quadratic forms II,” Usp. Mat. Nauk 4, 102–164 (1938).
4. B. N. Delone, N. P. Dolbilin, M. I. Shtogrin, and R. V. Galiulin, “A local criterion for the regularity of a system of points,” Sov. Math. Dokl. 17 (2), 319–322 (1976).
5. M. I. Shtogrin, “On the boundary of spider’s axis order in a locally regular Delone system,” Abstract of Papers, International Conference on Geometry, Topology, Algebra, and Number Theory, Applications Dedicated to the 120th Anniversary of the Birthday of Boris Nikolaevich Delone (1890–1980) (Moscow, August 16–20, 2010) (Steklov Math. Inst., Moscow, 2010), pp. 168–169.