1. S. S. Kiparisov, G. A. Libenson, in Powder metallurgy, Metallurgy, Moscow 1982, 496 p.
2. Porous permeable materials, (Editor: S. V. Belova), Metallurgy, Moscow 1987, 335 p.
3. Y. S. Lipatov, Y. Y. Kercha, L. M. Sergeeva, in Structure and properties of foamed polyurethanes, Nauk. Dumka, Kiev 1970, 277 p.
4. G. A. Bulatov, in Foamed polyurethanes in mechanical engineering and construction Mashinostroenie, Moscow 1978, 183 p.
5. V. M Kaptsevich, V. B Zhilkin, P. P. Shumeiko, Author's Certificate No. 1217578 (USSR). Method of a porous material manufacturing, et al. 1986.