- ProKARSTerra
- Bulgarian Academy of Sciences (BAS)
- National Institute in Geophysics, Geodesy and Geography (NIGGG) – BAS
- Foundation Center on Karstology "Vladimir Popov", Sofia, Bulgaria
- National Museum of Natural History (BAS), Sofia, Bulgaria
- National Museum "Earth and Man", Sofia, Bulgaria
- Bulgarian Ministry of Education and Science (MES)
- Bulgarian Ministry of Environment and Water (MEW)
- Executive Forests Agency – Bulgarian Ministry of Agriculture and Food (MAF)
- Directorate of Nature Park “Shumen Plateau”, Shumen, Bulgaria
- Directorate of Nature Park “Russenski Lom”, Russe, Bulgaria
- Directorate of Nature Park “Zlatni pjasatsi”, Varna, Bulgaria
- Directorate of Nature Park “Vrachanski Balkan”, Vratsa, Bulgaria
- Administration of Moravský kras PLA, Blansko, Czech Republic
- Cave Administration of the Czech Republic
- Akiyoshi-dai Quasi-National Park (Mine, Yamaguchi, Japan)
- Akiyoshi-dai Museum of Natural History, Akiyoshi, Japan
- Yamaguchi University (Japan)
- Zespół Parków Krajobrazowych Województwa Śląskiego, Poland
- UNESCO
- National Commission for UNESCO - Bulgaria
- International Union of Speleology (UIS)
- International Geographical Union (IGU)
- “GEOgraphy' 21” - Scientific-Methodological Journal, Bulgaria
- Regional public Library "Stilian Chilingirov” in Shumen, Bulgaria
- “Titan Zlatna Panega cement”, Bulgaria
- International Year of Caves and Karst (IYCK)