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A. Albert,*Regression and the Moore-Penrose Pseudoinverse*, Academic Press, New York, 1972.

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A. Ben-Israel, T. N. E. Greville,*Generalized Inverses: Theory and Applications*, John Wiley & Sons, New York, 1974.

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T. L. Boullion, P. L. Odell,*Generalized Inverse Matrices*, Wiley-Interscience, New York, 1971.

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L. Eldén,*A note on weighted pseudoinverses with application to the regularization of Fredholm integral equations of the first kind*, Department of Mathematics, Linköping University, Report LiTH-MATR-1975-11, 1975.

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L. Eldén,*Algorithms for the regularization of ill-conditioned least squares problems*, BIT*17* (1977), 134–145.

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L. Eldén,*Perturbation theory for the least squares problem with linear equality constraints*, SIAM J. Num. Anal.*17* (1980), pp. 338–350.

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G. H. Golub,*Some modified eigenvalue problems*, SIAM Review 15 (1973), pp. 318–334.

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C. L. Lawson, R. J. Hanson,*Solving Least Squares Problems*, Prentice-Hall, Englewood Cliffs, 1974.

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D. G. Luenberger,*Introduction to Linear and Nonlinear Programming*, Addison-Wesley, Reading Mass., 1973.

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K. Miller,*Least squares methods for ill-posed problems with a prescribed bound*, SIAM J. Math. Anal.*1* (1970), pp. 52–74.

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S. K. Mitra, C. R. Rao,*Projections under seminorms and generalized Moore Penrose inverses*, Lin. Alg. Appl.*9* (1974), pp. 155–167.

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S. K. Mitra,*Optimal inverse of a matrix*, Sankhya, Ser. A,*37* (1975) pp. 550–563.

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V. A. Morozov,*Regularization Methods for the Solution of Improperly Posed Problems*, Moscow University Press, Moscow, 1974 (Russian).

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A. D. Poley,*Connections between some results on the generalized least squares problem*, Techn. Univ. Eindhoven, Dep. Math., TH-Report 81-WSK-01, 1981.

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C. M. Price,*The matrix pseudoinverse and minimal variance estimates*, SIAM Review*6* (1964), pp. 115–120.

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C. R. Rao, S. K. Mitra,*Generalized Inverse of Matrices and its Applications*, John Wiley & Sons, New York, 1971.

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V. F. Turchin,*Selection of an ensemble of smooth functions for the solution of the inverse problem*, Zh. Vychisl. Mat. Mat. Fiz.*8* (1968), 230–238=USSR Comp. Math. Math. Phsy*8* (1968), pp. 328–339.

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C. F. Van Loan,*Generalizing the singular value decomposition*, SIAM J. Numer. Anal.*13* (1976), pp. 76–83.

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J. F. Ward,*On a limit formula for weighted pseudoinverses*, SIAM J. Appl. Math.*33* (1977), pp. 34–38.

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P.-Å Wedin,*Notes on the constrained least squares problem. A new approach based on generalized inverses*. Report UMINF - 75.79, Department of Numerical Analysis, Umeå University, 1979.