1. Workshop on materials science and the physics of non-conventional energy sources;Lampert,1987
2. Solar absorber selective paint research
3. A paint for selective solar absorbers
4. B. Orel, Z. Crnjak Orel, M. Klanhsěk Gunde, I. Radoczy and M. Vodlan, Yugoslav patent No. 10912, P784/85, Ljubljana, Yugoslavia.