1. R. P. Bambah, V. C. Dumir and R. J. Hans-Gill, Non-homogeneous problems: Conjectures of Minkowski and Watson, Number Theory, Trends in Mathematics, Birkhauser Verlag, Basel (2000), 15–41.
2. B. J. Birch and H. P. F. Swinnerton Dyer, On the inhomogeneous minimum of the product of n linear forms, Mathematika, 3 (1956), 25–39.
3. H. F. Blichfeldt, The minimum values of positive quadratic forms in six, seven and eight variables, Math. Z., 39 (1934), 1–15.
4. N. Cebotarev, Beweis des Minkowski’schen Satzes über lineare inhomogene Formen, Vierteljschr. Naturforsch. Ges. Zurich, 85 Beiblatt, (1940), 27–30.
5. H. Cohn and N. Elkies, New upper bounds on sphere packings. I. Ann. of Math., 157(2) (2003), 689–714.