1. Metric methods in linear inequalities;Blumenthal, Leonard M.;Duke Math. J.,1948
2. The generation of convex hulls;Bonnice, William;Math. Ann.,1963
3. L. Danzer, B. Grünbaum, and V. Klee, Helly’s theorem and its relatives, Proc. Sympos. Pure Math., Vol. 7, Amer. Math. Soc., Providence, R. I., 1963, pp. 101-180.
4. Theory of positive linear dependence;Davis, Chandler;Amer. J. Math.,1954
5. L. L. Dines and N. H. McCoy, On linear inequalities, Trans. Roy. Soc. Canada 27 (1933), 37-70.