1. Existence of an A-optimal model for a regression experiment;Chan;J. Math. Anal. Appl.,1980
2. Locally optimum designs for estimating parameters;Chernoff;Ann. Math. Statist.,1953
3. Problems of optimal control of a regression experiment;Dorogovcev;Selected Transl. Math. Statist. Probab.,1971
4. Optimum allocation in linear regression theory;Elfving;Ann. Math. Statist.,1952
5. On a theorem of Weyl concerning eigenvalues of linear transformations, I;Fan,1949