Hoernell-Willebrand, M., Marcstroem, V., Brittas, R. & Willebrand, T. (2006). Temporal and spatial correlation in chick production of willow grouse Lagopus lagopus in Sweden and Norway. Wildlife Biology 12 (4), 347-355. 10.2981/0909-6396(2006)12[347:TASCIC]2.0.CO;2.