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References used

Crane, J. C., J. Iwakiri, B, T. 1985. Végétative and reproductive apical dominance in pistachio Hort. Sci: 20(6): 1092-1093
ahn,A., et. Benayoun, J. 1976. Ultrastructure of resin ducts in Pinus halepensis: Development, possible sites of resin systhesis and mode of its elimination from The protoplast . Ann. Bot.(London ), 40:857-863
Hanes, C. S. 1927. Resin canals in seedlings Conifers. J.Linn. Soc.London, Bot. 47: 613 – 636

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