Boiko, A. A. Sol-Gel Materials Doped with Transition Element Ions and Nanoparticles / A. A. Boiko, E. N. Poddenezhny // Sol-Gel Materials’04 Research, Technology, Applications : abstracts of int. conf., Wroclaw, Poland, 6-11 June 2004. – Wroclaw, Poland. – 2004. – P. 64.