Koleva, Minka, and Milena Radevska. “ Influence of Duration of Storage and Pre-Sowing Electromagnetic Treatment on the Sowing Qualities of Cotton Seeds I. Germination Energy and Laboratory Germination”. Bulgarian Journal of Crop Science, vol. 58, no. 6, Dec. 2021, pp. 60-67, https://agriacad.eu/ojs/index.php/bjcs/article/view/2248.