1. Angermann, D., M. Gerstl, R. Kelm, H. Müller, W. Seemüller, M. Vei (2001): Time Evolution of the SLR Reference Frame. Adv. in Space Res., in review.
2. Beutler, G., H. Drewes, C. Reigber, R. Rummel (1998). Space Techniques and their Coordination with IAG at Present and in Future. In: Rummel, R., H. Drewes, W. Bosch, H. Hornik (eds). Towards an Integrated Global Geodetic Observing System (1GGOS), Vol. 120, Springer Berlin, pp. 22 - 32.
3. Boucher, C., Z. Altamimi, P. Sillard (1999). The 1997 International Terrestrial Reference Frame (ITRF97). 1ERS Technical Note
27, Observatoire de Paris.
4. Herring, T. (1997), MIT T2 Associate Analysis Center. International GPS Service (IGS) 1996 Annual Report, pp. 255 - 267.
5. Montag, H., G. Gendt, P. Wilson (1996). On the determination of the terrestrial reference frame by SLR and GPS techniques. Journal of Geodynamics, Vol. 22, No. 1 /2, pp. 63 - 77.