1. Contributions to the Theory of Generalized Inverses for Matrices;den Broeder,1957
2. A note on weighted pseudoinverses with applications to the regularization of Fredholm integral equations of the first kind;Eldén;Department of Mathematics, Linköping University, Report LiTH-MAT-R-1975-11,1975
3. A weighted pseudoinverse, generalized singular values, and constrained least squares problems;Eldén;BIT,1982
4. Generalized Inverses of Linear Operators: Representation and Approximation;Groetsch,1977
5. A note on restricted pseudoinverses;Hartung;SIAM J. Math. Anal.,1979