Glass-Carbon Bioactive Coatings on a TiO2- Nb2O5 Substrate - TEODOSIEV, Dimitar; ANESTIEV, Lubomir; GEORGIEV, Jordan; PETROV, Nartzislav; TZVETKOV, Petar; NIKOLOVA, Hristiana (The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, 2010)