Szász, S., Bogenfürst, F. and Varju, M. (1999) “Development of the fourth primary wing feathers in three types of duck”, Acta Agraria Kaposváriensis, 3(2), pp. 239–245. Available at: https://journal.uni-mate.hu/index.php/aak/article/view/1557 (Accessed: 5 December 2025).