Ho, Rong H. Optimum timing of gibberellin A4/7 sprays to promote cone production in jack pine seedlings / Rong H. Ho, Oldrich Hak. -- 1.vyd.

In New Forest. -- 8, (1994), s. 61-69. graf.

I. Hak, Oldrich
II. New Forest. -- 8, (1994), s. 61-69. graf.
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