1. Zanderman, V., Prirodnye smoly, skipidary, talovoe maslo (khimiya i tekhnologiya) (Natural Gums, Turpentines, Pine Oil), Chemistry and Technology, Moscow, 1964.
2. Cai Ling, Tuliao Gongye, 2005, vol. 35, p. 39.
3. SU Patent No. 584 722 A1 19 940 715, Byull. Izobret., No. 13 (1994).
4. Haslinger, E. and Hofner, D., Monatsh. Chem., 1998, vol. 129, p. 297.
5. Delevallee, F., Daraedt, R., and Verzoni, J., FR Patent 8 512 619. Eur. Patent 211 774, Chem. Abstr, 1987, vol. 106, no. 182 679.