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4. Bhat, K.M., A note on aggregate rays of Betula species, IAWA Bull., N. S., 1983, vol. 4. nos. 2-3, pp. 183–185.
5. Bhat, K.M. and Kärkkäinen, M., Distinguishing between Betula pendula Roth. and Betula pubescens Ehrh. on the basis of wood anatomy, Silva Fen., 1980, vol. 14, no. 3, pp. 294–304.