1. Ardamatskaya, T.B., The influence of mass bird colonies on the vegetation and animal population of the Orlov island, in Struktura i funktsional’no-biogeotsenoticheskaya rol' zhivotnogo naseleniya sushi (Structure and Functional and Biogeocenotic Role of the Animal Population of the Land), Moscow: Nauka, 1967, pp. 113–114.
2. Bitvinskas, T.T., Dendroklimaticheskie issledovaniya (Dendroclimatic Studies), Leningrad: Gidrometeoizdat, 1974.
3. Björklund, J.A., Gunnarson, B.E., Seftigen, K., Esper, J., and Linderholm, H.W., Blue intensity and density from northern Fennoscandian tree rings, exploring the potential to improve summer temperature reconstructions with earlywood information, Clim. Past, 2014, vol. 10, pp. 877–885.
4. Björklund, J.A., Gunnarson, B.E, Seftigen, K., Zhang, P., and Fuentes, M., Using adjusted blue intensity data to attain high quality summer temperature information: A case study from Central Scandinavia, Holocene, 2015, vol. 25, no. 3, pp. 547–556.
5. Breslina, I.P. and Karpovich, V.N., Development of vegetation under the influence of the activity of colonial birds, Bot. Zh., 1969, no. 5, pp. 690–696.