(1)
Ciereszko, A.; Kowalczyk, A.; Lukaszewicz, E.; Krzywinski, A.; Kobus, A.; Dietrich, G. J. Sperm Characteristics of Male Hybrid from a Cross Between Male Black Grouse Tetrao Tetrix and Female Capercaillie T. Urogallus. Ornis Fenn 2009, 86, 149–152.