Tsvetkov, Tsvetan, Denica Daskalova, Nadya Petrova, Hristina Blagova, Detelina Vitanova, and Rositsa Shumkova. 2024. “Trehalose, Glycerol and Dimethyl Sulfoxide Supplementation for Cryopreservation Media of Honey Bee Drone Semen”. Proceedings of the Bulgarian Academy of Sciences 77 (7). Sofia, Bulgaria:997–1004. https://doi.org/10.7546/CRABS.2024.07.06.