[1]
E. Pulliainen, “Food selection in the tetraonid hybrids Lyrurus tetrix x Tetrao urogallus, Lyrurus tetrix x Lagopus lagopus and Tetrao urogallus x Lagopus lagopus”, Ornis Fenn, vol. 59, no. 4, pp. 170–174, Dec. 1982.