3Tulecke W. R.Preservation and germination of the pollen of Gingo under sterile conditions.Bull.Torrey Bot.Club., 1954,81:509-512.
4Friedman W.Photosynthesis in the female gametophyte of Ginkgo biloba.Amer J Bot,1986,73:1261-1266.
5Willian E,Friedman,Ernest M Gifford.Division of the generative cell and late development in the male gametophyte of Ginkgo biloboa. Amer.J.Bot, 1988,75(9):1434-1442.