Kirkwood, Renata Noce, Scott C.E. Brandon, Bruno de Souza Moreira, and Kevin J. Deluzio. “Searching for Stability As We Age: The PCA-Biplot Approach”. International Journal of Statistics in Medical Research 2, no. 4 (October 31, 2013): 255–262. Accessed November 23, 2024. https://lifescienceglobal.com/pms/index.php/ijsmr/article/view/1415.