1. C. R. Boggs u.J. T. Bloke, Ind. Engng. Chem.22, 748 (1930).
2. G. Bruni u.Oberto, Rev. gen. Cautchouc8, 19 (1931).
3. W. F. Busse, J. physic. Chem.36, 2862 (1932).
4. H. Fikentscher u.H. Mark, Kautschuk6, 2 (1930);Rubber, Chem. Techn.3, 309 (1930).
5. J. Gough, Mem. Manchester Lit. d. Phil. Soc.1 (2), 285 (1805).