TY  - CPAPER
AU  - Vesselin Alexandrov
TI  - UTILIZATION OF SPI, PDSI AND RDI AS DROUGHT INDICATORS IN SOUTH BULGARIA
T2  - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2011 11th International Multidisciplinary Scientific GeoConference
PY  - 2011
DO  - 10.5593/sgem2011/s13.128
PB  - Stef92 Technology
ER  -