Kuteev, F. S. 1963. Prichiny usykhaniya pikhty na severnom kavkaze [Causes of the drying-up of fir in North Caucasia]. Zashchita lesnykh nasazhdenii ot vreditelei i boleznei. Lesnoe Khoziaistvo 1963:2-36. [Translation: Canada Department of Forestry, Translation 145. 54 p.].