1. Faculty of Agricultural Sciences and Food, Ss. Cyril and Methodius University in Skopje, Macedonia.
2. Company for Applied Research and Permanent Education in Agriculture, Skopje, Macedonia.
3. Swedish University of Agricultural Sciences, Uppsala, Sweden.
4. Norwegian Beekeepers Association, Norway.
5. Faculty of Agrobiotechnical Sciences Osijek, Croatia.
6. Centre for applied life sciences Healthy Food chain Ltd, Osijek, Croatia.
7. Agricultural Institute of Slovenia, Slovenia.
8. Eko Pcela, Skopje, Macedonia.
9. Bee Research Institute, Hohen Neuendorf, Germany.
10. Landesbetrieb Landwirtschaft Hessen, Bieneninstitut Kirchhain, Germany.