1. “Invariant Fourier Descriptors,”;Luerkens;Powder Technology,1982
2. Hsyung, N.B., Luerkens, D. W. and Beddow, J.K. “Morphological Textural Features”, paper submitted to IEEE TRANS ON PATTERN RECOGNITION AND MACHINE INTELLIGENCE, 1987.
3. “The R-Theta Method Derived from A Variational Principle”;Luerkens;Particulate Science and Technology,1986
4. “Particle Surface Representations Derived from A Variational Principle”–1. The Grey Level Function”;Luerkens;Particulate Science and Technology,1986
5. “Particle Surface Morphologies–The Three-Dimensional Particle”;Luerkens;Particulate Science and Technology,1986