8Yang P F. Studies on the cell micro-ultra-structure of the secondary vascular tissue of the spem of the spur- type apple[J].Acta Horticulture, 1995,403:161-168.
9Vilma Bayramzadeh, Ryo Funada, Takafumi Kubo. Relationships between vessel element anatomy and physiological as well as morphological traits of leaves in Fagus crenata seedlings originating from different provenances[J].Tree,2008,22(2):217-224.
