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1990
Shaffer, C. A., Bit interleaving for quad or octrees, , San Diego, CA, USA, Academic Press Professional, Inc., pp. 443–447, 1990.
Shaffer, C. A., and D. B. Boldery, The Elevation Pyramid, , Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1990.
Shaffer, C. A., Fast circle-rectangle intersection checking, , San Diego, CA, USA, Academic Press Professional, Inc., pp. 51–53, 1990.
Shaffer, C. A., "A full resolution elevation representation requiring three bits per pixel", SSD '90: Proceedings of the first symposium on Design and implementation of large spatial databases, New York, NY, USA, Springer-Verlag New York, Inc., pp. 45–64, 1990.
Ang, C. - H., H. Samet, and C. A. Shaffer, "A New Region Expansion for Quadtrees", IEEE Trans. Pattern Anal. Mach. Intell., vol. 12, no. 7, Washington, DC, USA, IEEE Computer Society, pp. 682–686, 1990.
Shaffer, C. A., H. Samet, and R. C. Nelson, "QUILT: A Geographic Information System Based on Quadtrees", International Journal of Geographic Information Systems, vol. 4, no. 2, pp. 103–131, 1990.
Shaffer, C. A., and G. M. Herb, A Real Time Robot Arm Collision Detection System, , Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1990.
Shaffer, C. A., and G. M. Herb, "A real-time robot collision avoidance system (abstract)", CSC '90: Proceedings of the 1990 ACM annual conference on Cooperation, New York, NY, USA, ACM, pp. 441, 1990.
Shaffer, C. A., and H. Samet, "Set operations for unaligned linear quadtrees", Computer Vision, Graphics & Image Processing, vol. 50, no. 1, San Diego, CA, USA, Academic Press Professional, Inc., pp. 29–49, 1990.
1989
Shaffer, C. A., R. Juvvadi, and L. S. Heath, A Generalized Comparison of Quadtree and Bintree Storage Requirements, , Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1989.
Shaffer, C. A., and Q. F. Stout, Linear Time Distance Transforms for Quadtrees, , Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1989.
Lattanzi, M., and C. A. Shaffer, An Optimal Boundary to Quadtree Conversion Algorithm, , Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1989.
1988
Oskard, D. N., T. - H. Hong, and C. A. Shaffer, "Real-Time Algorithms and Data Structures for Underwater Mapping", SPIE Symposium on Sensor Fusion: Spatial Reasoning and Scene Interpretation, November, 1988.
Ang, C. - H., H. Samet, and C. A. Shaffer, "Fast Region Expansion for Quadtrees", Proceedings of the Third International Symposium on Spatial Data Handling, pp. 19–38, August, 1988.
Shaffer, C. A., and H. Samet, "Algorithm to expand regions represented by linear quadtrees", Image Vision Comput., vol. 6, no. 3, Newton, MA, USA, Butterworth-Heinemann, pp. 162–168, 1988.
Shaffer, C. A., "A formula for computing the number of quadtree node fragments created by a shift", Pattern Recognition, vol. 7, no. 1, New York, NY, USA, Elsevier Science Inc., pp. 45–49, 1988.
Shaffer, C. A., and H. Samet, Set Operations for Unaligned Linear Quadtrees, , Blacksburg, VA, USA, Virginia Polytechnic Institute & State University, 1988.
1987
Samet, H., C. A. Shaffer, and R. E. Webber, "Digitizing the plane with cells of nonuniform size", Inf. Process. Lett., vol. 24, no. 6, Amsterdam, The Netherlands, The Netherlands, Elsevier North-Holland, Inc., pp. 369–375, 1987.
Shaffer, C. A., and H. Samet, "Optimal quadtree construction algorithms", Comput. Vision Graph. Image Process., vol. 37, no. 3, San Diego, CA, USA, Academic Press Professional, Inc., pp. 402–419, 1987.
1986
Shaffer, C. A., and H. Samet, "An Optimal Quadtree Construction Algorithm", Proceedings of the Eighth International Conference on Pattern Recognition, pp. 317–319, October, 1986.
Shaffer, C. A., "An Empirical Comparison of Vectors, Rasters, and Quadtrees for Representing Geographic Data", Proceedings of the International Colloquium on the Construction and Display of Geoscientific Maps Derived from Databases, Geologisches Jahrbuch A 104, pp. 99–115, December, 1986.
Samet, H., C. A. Shaffer, R. C. Nelson, Y. - G. Huang, K. Fujimura, and A. Rosenfeld, "Hierarchical Data Structures for Geographic Information", Proceedings of the International Colloquium on the Construction and Display of Geoscientific Maps Derived from Databases, Geologisches Jahrbuch A 104, pp. 97–98, December, 1986.
Shaffer, C. A., Application of alternative quadtree representations, , College Park, MD, USA, University of Maryland at College Park, 1986.
Samet, H., C. A. Shaffer, R. C. Nelson, Y. -geng Huang, K. Fujimura, A. Rosenfeld, and D. Marble, "Recent Developments in Quadtree-Based Geographic Information Systems", Proceedings of the Second International Symposium on Spatial Data Handling, Seattle, Washington, pp. 15–32, 1986.
Samet, H., C. A. Shaffer, and R. E. Webber, "Using linear quadtrees to store vector data", Eurographics Seminars on Data structures for raster graphics, New York, NY, USA, Springer-Verlag New York, Inc., pp. 91–123, 1986.