1. Graham A. (1981). Kronecker products and matrix calculus with applications Ellis Horwood London.
2. Han S. and Rizos C. (1999). “The impact of two additional civilian GPS frequencies on ambiguity resolution strategies.” Proc. ION-NTM 1999 Cambridge Mass. Satellite Division of the Institute of Navigation Fairfax Va. 315–321.
3. Civilian GPS: The Benefits of Three Frequencies
4. Hofmann-Wellenhof B. Lichtenegger H. and Collins J. (2001). Global positioning system: Theory and practice 5th Ed. Springer Berlin.
5. Rank defect integer least-squares with applications to GPS.;Teunissen P. J. G.;Bolletino di Geodesia e Scienze Affini,1996