1. A. R. Jones, Tappi 51 (1968) 203.
2. L. Nordman, ?Fundamentals of Papermaking Fibres?, (edited by F. Bolam) (Tech. Sect. British Paper and Board Makers' Assoc., Kenley, 1958) p. 333.
3. D. H. Page and P. A. Tydeman, ?The Formation and Structure of Paper?, (edited by F. Bolam) (Tech. Sect. British Paper and Board Makers' Assoc., London, 1962) p. 397.
4. G. R. Sears, R. F. Tyler and C. W. Denzer, Pulp Paper Mag. Can. 66 (1965) T351.
5. F. A. Macmillan, W. R. Farrell and K. G. Booth, Pulp Paper Mag. Can. 66 (1965) T361.