• Cronshaw, J. & Bouck, G. B. (1965). The fine structure of differentiating xylem elements. J. Cell Biol., 24, 115.
  • Hepler, P. K. & Newcomb, E. H. (1964). Microtubules and fibrils in the cytoplasm of Coleus cells undergoing secondary wall deposition. J. Cell Biol., 20, 529.
  • Ledbetter, M. C. & Porter, K. R. (1963). A ‘microtubule’ in plant cell fine structure. J. Cell Biol., 19, 239.
  • Mollenhauer, H. H. (1964). Plastic embedding mixtures for use in electron microscopy. Stain Technol., 39, 111.
  • Moor, H. & Mühlethaler, K. (1963). Fine structure in frozen-etched yeast cells. J. Cell Biol., 17, 609.
  • Mühlethaler, K. (1965). Growth theories and the development of the cell wall. In: Cellular Ultrastructure of Woody Plants (Ed. by W. A.Coté, Jr), pp. 5160. Syracuse University Press.
  • Mühlethaler, K. (1967). Ultrastructure and formation of plant cell walls. A. Rev. Pl. Physiol., 18, 1.
  • Murmanis, L. (1971). Structural changes in the vascular cambium of Pinus strobus L. during an annual cycle. Ann. Bot., N.S. 35, 133.
  • Murmanis, L. & Sachs, I. B. (1969). Seasonal development of secondary xylem in Pinus strobus L. Wood Sci. and Tech., 3, 177.
  • Preston, R. D. (1964). Structural and mechanical aspects of plant cell walls with particular reference to synthesis and growth. In: Formation of Wood in Forest Trees (Ed. by M. H.Zimmerman), pp. 169188. Academic Press, New York.
  • Robards, A. W. (1969). Particles associated with developing plant cell walls. Planta, 88, 376.
  • Roland, J. C. (1967). Aspects infrastructuraux des relations existant entre le protoplasme et la paroi des cellules de collenchyme. J. Microscopic, 9, 399.
  • Wooding, F. B. P. & Northcote, D. H. (1964). The development of the secondary wall of the xylem in Acer pseudoplatanus. J. Cell Biol., 23, 327.