Sjöberg, Kjell, et al. “Differences in Bird Habitat Quality Between Plantations of Scots and Lodgepole Pine Measured in Terms of Pied Flycaatcher Ficedula Hypoleuca Breeding Success”. Ornis Svecica, vol. 3, no. 2, Apr. 1993, pp. 59-68, doi:10.34080/os.v3.23044.