J. Cassels, Bounds for the least solutions of homogeneous quadratic equations, Proc. Cambridge Philos. Soc, vol.51, pp.262-264, 1955.

W. K. Chan, L. Fukshansky, and G. Henshaw, Small zeros of quadratic forms outside a union of varieties, Trans. Amer. Math. Soc, vol.366, pp.5587-5612, 2014.

H. Davenport, Note on a theorem of Cassels, Proc. Cambridge Philos. Soc, vol.53, pp.539-540, 1957.

L. Fukshansky, Small zeros of quadratic forms with linear conditions, J. Number Theory, vol.108, pp.29-43, 2004.

L. Fukshansky, Small zeros of quadratic forms over Q, Int. J. Number Theory, vol.4, pp.503-523, 2008.

É. Gaudron, G. Rémond, and J. Corps-de-siegel,

É. Gaudron and G. Rémond, Espaces adéliques quadratiques, vol.34

D. Masser, How to solve a quadratic equation in rationals, Bull. London Math. Soc, vol.30, pp.24-28, 1998.

H. P. Schlickewei, Kleine Nullstellen homogener quadratischer Gleichungen, Monatsh. Math, vol.100, pp.35-45, 1985.

J. Vaaler, Small zeros of quadratic forms over number fields, Trans. Amer. Math. Soc, vol.302, pp.281-296, 1987.