TY - CPAPER AU - Mariana Hristova AU - Veselina Vasileva AU - Viktoriya Kancheva AU - Ana Katsarova AU - Nikolai Dinev TI - CHEMICAL LINE OF EVIDENCE FOR ECOLOGICAL RISK ASSESSMENT: HEAVY METAL FORMS AS INDICATORS FOR AN ADVISORY SYSTEM IN THE TOPOLNITSA RIVER BASIN T2 - SWS 2026 Conference Preprints PY - 2026 PB - STEF92 Technology ER -