1. Ahmed, F. R. & Pippy, M. E. (1968) Crystallographic computer programmes (NRC- no. 3, 8, 12, 22). World list of Crystallographic Computer Programs, 2nd ed., p. 52.
2. Beurskens, P. T., Cras, J. A., Noordik, J. H. & Spruijt, A. M. (1971).J. Cryst. Mol. Struct,1, 93.
3. Brinkhoff, H. C., Cras, J. A., Steggerda, J. J. & Willemse, J. (1969).Rec. Trav. Chim. 88, 633.
4. Brinkhoff, H. C. (1970) Thesis, Nijmegen.
5. Busing, W. R., Martin, K. O. & Levy, H. A. (1962) Fortran Least-squares program (ORFLS). Oak Ridge National Laboratory Report 305.