• Burkholder, E. F, Spatial data, coordinate systems, and the science of measurement, J. Surveying Engineering, 127, 143156, 2001.
  • Burkholder, E. F, Using GPS results in true 3-D coordinate system, ASCE J. Surveying Engineering, 119, 121, 1993.
  • Egenhofer, M. J., and R. G. G olledge, Spatial and Temporal Reasoning in Geographic Information Systems, Oxford University Press, N.Y, 1998.
  • Kuhn, T. S., The Structure of Scientific Revolutions, University of Chicago Press, Chicago, Ill., 1970.
  • , U.S. Department of Defense, World Geodetic System 1984: Its Definition and Relationships with Local Geodetic Systems, 3rd edTechnical Report TR8350.2National Imagery and Mapping Agency, Bethesda, Md., 1997.