1. Ducketl, K. E. 1975.‘Surface Characteristics of Fibres and Textiles’, Part 1, Edited by: Schick, M. J. 67New York and Basle: Dekker.
2. Sikorski, J., Moss, J. S., Hepworth, A. and Buckley, T. 1969.‘Proceedings of Second Stereoscan Colloquium’, 25U.S.A.: Engis Equipment Co. Morton Grove. III.
3. Bywater, N. E., Buckley, T., Hepworth, A. and Sikorski, J. 1972.‘Proceedings of Fifth European Congress on Electron Microscopy, Manchester’, 384London: Institute of Physics.