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Thierry Deroin, Functional Impact of the Vascular Architecture of Flowers in Annonaceae and Magnoliaceae, and Its Bearing on the Interpretation of the Magnoliaceous Gynoecium, Systematics and Geography of Plants, Vol. 68, No. 1/2, Morphology, Anatomy and Systematics at the Centenary of Wilhelm Troll's Birth (1999), pp. 213-224
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Thierry Deroin (1999) studied this question.
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