1. G. Jeronimidis, Leiden Botanical Series 3 (1976) 253.
2. J. E. Gordon and G. Jeronimidis, Nature 252 (1974) 116.
3. J. F. Knott, “Fundamentals of Fracture Mechanics” (Butterworths, London, 1973) p. 105.
4. E. C. McLaughlin and R. A. Tait, to be published.
5. R. E. Mark, “Cell Wall Mechanics of Tracheids” (Yale University Press, New Haven, 1967) p. 97.