A. I. TIMOFTE, D. PAMFIL, M. PALADA-NICOLAU, and C. S. TIMOFTE, “The Effect of Different Factors upon the in vitro Propagation in Quercus robur and Q. frainetto by Somatic Embryogenesis”, Not Bot Horti Agrobo, vol. 39, no. 1, pp. 288–291, May 2011.