Pistorius, Jens, Thomas Steeger, Anne Alix, Helen Thompson, Guy Smagghe, Sjef van der Steen, and Peter Kevan. “Obituary: A Life Devoted to Bee Protection: The Legacy of Pieter Oomen”. Journal of Pollination Ecology 36 (October 16, 2024): 267–268. Accessed October 17, 2024. https://pollinationecology.org/index.php/jpe/article/view/815.