https://malepsychology.org.uk/2018/12/04/why-are-there-so-many-disagreements-about-gender-issues-its-usually-down-to-gamma-bias/
https://thepsychologist.bps.org.uk/volume-33/april-2020/gamma-bias-new-theory
https://link.springer.com/chapter/10.1007/978-3-030-04384-1_5
https://zenodo.org/record/4420901#.YflQiEZBxhH