Autori:
1. Risto Dambov, University GoceDelcev, Stip Insitute of Mining, Stip, R. Macedonia, Macedonia
2. Fausto Brandi, Fausto Brandi, CHIMICA EDILE, Srl, Grosseto, Italy, Italy
3. Ilija Dambov, Bucim Mine, Radovis, R. Macedonia, Macedonia

Sažetak rada