Kale, N, et al. “A Case of Parathyroid Adenoma With Brown Tumors Diagnosed by 201Thallium-99m Technetium Subtraction Scintigraphy”. The Turkish Journal of Pediatrics, vol. 32, no. 3, July 1990, pp. 225-7, https://turkjpediatr.org/article/view/3813.