1. W.-T. Ni and Y. Xia, "ASTROD and ASTROD I" submitted to Nuclear Physics B; and references therein
2. W.-T. Ni, "ASTROD and ASTROD I: an overview", Gen. Relat. Gravit., Vol. 38, 2006, in press
3. A. Pulido Patón and W.-T. Ni "The low- frequency sensitivity to gravitational waves for ASTROD" Gen. Relat. Gravit., Vol 38, 2006, in press
4. Acceleration disturbances and requirements for ASTROD I