Svensson, T. (2021). "A review of mass concentrations of Bramblings Fringilla montifringilla: implications for assessment of large numbers of birds". Ornis Svecica. 31: 44–67. arXiv:2010.08465. doi:10.34080/os.v31.22031.
Jenni, L. (1987). "Mass concentrations of Bramblings Fringilla montifringilla in Europe 1900–1983: their dependence upon beech mast and the effect of snow-cover". Ornis Scandinavica. 18 (2): 84–94. doi:10.2307/3676843. JSTOR3676843.
Svensson, T. (2021). "A review of mass concentrations of Bramblings Fringilla montifringilla: implications for assessment of large numbers of birds". Ornis Svecica. 31: 44–67. arXiv:2010.08465. doi:10.34080/os.v31.22031.
Jenni, L. (1987). "Mass concentrations of Bramblings Fringilla montifringilla in Europe 1900–1983: their dependence upon beech mast and the effect of snow-cover". Ornis Scandinavica. 18 (2): 84–94. doi:10.2307/3676843. JSTOR3676843.