1. M.P. do Carmo, Differential Geometry of Curves and Surfaces, Prentice-Hall, Engelwood Cliffs, NJ, 1976.
2. S. Hyde, S. Andersson, K. Larsson, Z. Blum, T. Landh, S. Lidin, B.W. Ninham, The Language of Shape. The Role of Curvature in Condensed Matter: Physics, Chemistry and Biology, Elsevier, Amsterdam, 1997.
3. Crystal Orientation and Plate Structure in Echinoid Skeletal Units
4. Minimal surface forms
5. Gabo's geometry