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• Gordon, D., Ma, C., Ryan, J., Smith, D., & Turcotte, D.
  (1993). Results from the CDP mobile VLBI program in the western United States. In D.E. Smith & D.L. Turcotte (Ed.), Contributions of Space Geodesy to Geodynamics, AGU Geodynamics Series (pp. 131–138).
• Rogers, A., Cappallo, R., Corey, B., Hinteregger, H., Niell, A., Phillips, R., Smythe, D., Whitney, A., Herring, T., Bosworth, J., Clark, T., Ma, C., Ryan, J., Smith, D., & Turcotte, D.
  (1993). Improvements in the accuracy of geodetic VLBI. Contributions of Space Geodesy to Geodynamics (pp. 47–63).