1. Studies in practical mathematics. IV, on linear approximation by least squares;Aitken,1945
2. Dynamic programming and ill-conditioned linear systems;Bellman;Journal of Mathematical Analysis and Applications,1965
3. Numerical Inversion of the Laplace Transform;Bellman,1966
4. On least squares with insufficient observations;Chipman;Journal of the American Statistical Association,1964
5. Estimation and aggregation in econometrics: An application of the theory of generalized inverses;Chipman,1976