Below you’ll find a list of research papers and stories that I’ve found interesting to read, it’s up to you how you feel about the information.
Just keep in mind everyone is different and the information might not be what your looking for and just an interesting read.
These reports are articles that I have come across when researching XYY myself.
Judith L. Ross, MD, David P. Roeltgen, MD, […], and Nicole Tartaglia, MD
Nettie Stevens-
https://en.m.wikipedia.org/wiki/Nettie_Stevens
http://europepmc.org/search?query=47XYY%20
https://www.hindawi.com/journals/crie/2015/802162/