1. (1) J. M. De Bell, W. C. Goggin, and W. E. Gloor : “German Plasics Practice” Springfield, Mass., De Bell and Richardson (1946) p. 300.
2. (2) Mod. Plast. 24, No. 10,149 (June 1947)
3. (3) Chem. Abs. 41, 7766 (1947)
4. (4) Am. Paint J. 73 (April 12, 1948)
5. (6) Gardner : “Physical and Chemical Examination of Paints, Varnishes, Lacquers and Colors” 9 th Ed. (1939) p. 69