Esplana, Christian Cesar, and Jerome Barrera. “Primary Hyperparathyroidism from Parathyroid Carcinoma Presenting With Multiple Skeletal Fractures and Brown Cell Tumors”. Journal of the ASEAN Federation of Endocrine Societies, vol. 30, no. 2, Nov. 2015, p. 175, https://asean-endocrinejournal.org/index.php/JAFES/article/view/251.