U of Oregon Article: 

https://www.oregonlive.com/trackandfield/2021/10/women-athletes-allege-body-shaming-within-oregon-ducks-track-and-field-program.html

Body composition of elite athletes: https://journals.sagepub.com/doi/10.1177/036354658301100604?url_ver=Z39.88-2003&rfr_id=ori%3Arid%3Acrossref.org&rfr_dat=cr_pub++0pubmed&

Overtraining or Relative energy deficiency? https://pubmed.ncbi.nlm.nih.gov/34181189/

Athlete triad in female and male ultrarunners https://pubmed.ncbi.nlm.nih.gov/34232162/

Position stance and overview of RED-S: 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7146210/