T. Tsvetanov, R. Balkanska, and M. Ignatova, “Application of formic acid against Varroa destructor in spring using infrared heaters in the beehives”, BJAH, vol. 60, no. 3, pp. 21–27 (Bg), Jun. 2023, Accessed: Nov. 08, 2026. [Online]. Available: https://agriacad.eu/ojs/index.php/bjah/article/view/20