References
- 1. Schur, M. 0., and Rickards, J. C.: Tobacco Science 4 (1960) 69.
- 2. Lipp, G., and Nooy, H. van: Beitr. Tabakforsch. 1 (1962) 369.
- 3. Terrell, J. H., and Schmeltz, 1.: Tobacco Science 14 (1970) 82.
- 4. British Paper & Board Manufacturers Association Method PT 11.
- 5. British Standard B.S. 2925- Air Resistance Test.
- 6. T APPI Standard Method T 460 m - 49· 7· ASTM D7E6- 58