1.
Stoyanova A, Berberova R. Data analysis of the mid-winter census of wintering aquatic birds on the territory of Ramsar sites along the Bulgarian Black Sea coast for the period 2012 – 2021. ANSD [Internet]. 2023 Dec. 30 [cited 2025 Jun. 5];8:8-19. Available from: https://ojs.nbu.bg/index.php/ANSD/article/view/1123