1. A. G. Bashura, N. P. Polovko, et al., Technology of Cosmetics and Perfumes: Student Aide [in Russian], Izd. Natsional’nogo Farmatsevticheskogo Universiteta: Zolotye Stranitsy, Kharkov, 2002, 272 pp.
2. A. Yu. Krivova and V. Kh. Paronyan, Production Technology for Perfume and Cosmetic Products [in Russian], DeLi Print, Moscow, 2009, 668 pp.
3. G. M. Sessler and R. Gerhard-Multhaupt (eds.), Electrets, 3rd Ed. in 2 Vol., Laplacian Press, Morgan Hill, California, USA, Vol. 1, 1998, 472 pp; Vol. 2, 1999, 360 pp.
4. V. N. Kestelman, L. S. Pinchuk, and V. A. Gol’dade, Electrets in Engineering: Fundamentals and Applications, Kluwer Acad. Publ., Boston-Dordrecht-London, 2000, 281 pp.
5. M. Goel, Curr. Sci., 85, 443-453 (2003).