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Lele S, and JT Richtsmeier.  1990  Statistical models in morphometrics: are they realistic?  Syst Zoology, 39(1):60-69. https://doi.org/10.2307/2992208

Richtsmeier JT.  1990  Quantitative analysis of three-dimensional data. Society of Photo-Optical Instrumentation Engineers Conference (SPIE) Proceedings, 1380:49-60. 

Richtsmeier JT, GR Morris, JL Marsh, MW Vannier.  1990  The biological implications of varying element design in finite-element scaling analyses of growth.   Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 12(1):387-388.  DOI: 10.1109/IEMBS.1990.691128