Ohashi, Kaz, and Andreas Jürgens. “Three Options Are Better Than Two: Compensatory Nature of Different Pollination Modes in Salix Caprea L”. Journal of Pollination Ecology 28 (July 9, 2021): 75–90. Accessed April 18, 2024. https://pollinationecology.org/index.php/jpe/article/view/627.