Vincent M. Eckhart, Spatio-Temporal Variation in Abundance and Variation in Foraging Behavior of the Pollinators of Gynodioecious Phacelia linearis (Hydrophyllaceae), Oikos, Vol. 64, No. 3 (Sep., 1992), pp. 573-586
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Vincent M. Eckhart (1992) studied this question.
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