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The emergence of macrospore and the formation of female gametophyte in Pinus sylvestris var. mongolica
TIAN Cheng-Yu;ZHAO Chun-Jian;LI Chun-Ying;ZU Yuan-Gang*
Bulletin of Botanical Research . 2006, (6): 672 -675 .  DOI: 10.7525/j.issn.1673-5102.2006.06.008