1. Askeyev OV, Tischin D, Sparks TH, Askeyev IV (2005) The effect of climate on the phenology, acorn crop and radial increment of pedunculate oak (Quercus robur) in the middle Volga region, Tatarstan, Russia. Int J Biometeorol 49(4):262–266
2. Astrade L, Begin Y (1997) Tree-ring response of Populus tremula L. and Quercus robur L. to recent spring floods of the Saone river, France. Ecoscience 4(2):232–239
3. Betin VV, Preobrazhensky YV (1962) Severity of winters in Europe and ice cover of Baltic Sea. Hydrometeoizdat, Leningrad, p 108 (in Russian)
4. Bolychevtsev VG (1970) Annual rings in oak as an index of secular cycles of climatic fluctuations. Lesovedenie 1:15–23. (in Russian). English translation in J. M. Fletcher and W. Linnard. Russian papers in dendrochronology and dendroclimatology 1962, 1968, 1970, 1972. Research Laboratory for Archaeology, Oxford University, 1977
5. Borisenkov EP, Pasetsky VM (1988) Millennium long chronicle of extraordinary nature events. Mysl’ Press, Moscow, p 523 (in Russian)