1. Bio Ag Technologies International . Humic Acid Structure and Properties ; Bio Ag Technologies . West Sacramento, CA : International , 1999 .
2. Kornilaeva , G. ; Bercovich , A. ; Pavlova , T. ; Karamov , E. ‘‘New humic acid derivatives as potent inhibitors of HIV-1 replication’’ , International Conference on AIDS, RAMS, Moscow, July 15 16 , 2004 .
3. Humic substances - compounds of still unknown structure: applications in agriculture, industry, environment, and biomedicine