References
- George , T. W. and Keith , C. H. 1967 . Tobacco and Tobacco Smoke , 545 – 550 . New York : Academic Press .
- Newsome , J. R. , Norman , V. and Keith , C. H. 1965 . Tobacco Sci. , 19 : 102
- Bednarcyk , N. E. 1972 . Tobacco Smoke Filters , 124 – 130 . Park Ridge, New Jersey : Noyes Data Corp. .
- Collins , P. F. , Sarji , N. M. and Williams , J. F. 1973 . Beit. Tabak- forschung , 7 : 73
- Muller , R. , Moldenhauer , W. and Schlemmer , P. 1968 . Ber. Inst., Tabokforsch (Dresden) , 15 : 126