1. Ben-Israel, A. and T.N.E. Greville (1974). Generalized Inverses: Theory and Applications. J. Wiley, New York.
2. Bouillon, T.L. and P.L. Odell (1971). Generalized Inverse Matrices. Wiley-Interscience, New York.
3. Rao, C.R. and S.K. Mitra (1971). Generalized Inverse of Matrices and its Applications. J. Wiley, New York. The book by and mitra is probably the most cited references in the geodetic literature dealing with generalized inverses.
4. Bjerhammar, A. (1973). Theory of Errors and Generalized Matrix Inverses. Elsevier, Amsterdam. Bjerhammar was one of the first who started a systematic study of the problem of inverting of matrices of arbitrary order and rank. (see e.g. his paper [Bjerhammar, 1951].).
5. Grafarend, E., H. Heister, R. Keim, H. Kropff, and B. Schaffrin (1979). Optimierung Geodätischer Mess Operationen. Herbert Wichmann Verlag Karlsruhe. Band II.