1. Interpolation and Approximations;Davis,1963
2. A construction of nonnegative approximate quadratures;Davis;Math. Comp.,1967
3. Convex cones, sets, and functions;Fenchel;Princeton University Lecture Notes,1953
4. Programming in Linear Spaces;Hurwicz,1958
5. Positive Solutions of Operator Equations;Krasnoselskii,1964