TY  - CPAPER
AU  - Irena Kostova
TI  - ORIGIN OF SULFUR IN BALKAN COAL BASIN AND SOME RELATED ENVIRONMENTAL PROBLEMS
T2  - 1st International Scientific Conference - SGEM2001
PY  - 2001
SP  - 41
EP  - 50
PB  - SGEM Scientific GeoConference
ER  -