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Pearce, D.W.; Hutt, O.E.; Rood, S.B.; Mander, L.N., Gibberellins in shoots and developing capsules of Populus species, Phytochemistry, 2002, 59, 6, 679-687, https://doi.org/10.1016/S0031-9422(02)00009-2 . [all data]