"Beyond XX and XY: The Extraordinary Complexity of Sex Determination"
Amanda Montañez, Scientific American, September 1, 2017
https://www.scientificamerican.com/article/beyond-xx-and-xy-the-extraordinary-complexity-of-sex-determination/

"Sex redefined"
Claire Ainsworth, Nature volume 518, pages 288–291 (2015)
https://www.nature.com/articles/518288a