1. J. W. S. Cassels, An Introduction to the Geometry of Numbers (Springer-Verlag, Berlin–Heidelberg, 1959; Mir, Moscow, 1965).
2. P. M. Gruber and C. G. Lekkerkerker, Geometry of Numbers, in North-Holland Math. Library (North-Holland, Amsterdam, 1987), Vol. 37.
3. N. G. Moshchevitin, Mat. Zametki 58 4, 558 (1995) [Math. Notes 58 (3–4), 1066 (1995)].
4. A. M. Raigorodskii, Mat. Sb. 189 6, 117 (1998) [Sb. Math. 189 6, 931 (1998)].
5. A. M. Raigorodskii, Tr. Inst. Mat. Nat. Akad. Nauk Belarusi 15 1, 111 (2007).