Singh, A. K., P. Gogoi, P. Diwaker, B. Adhlakha, and A. Gayatree. “Osseous Metaplasia of Ovarian Cyst: A Rare Case Report”. International Surgery Journal, vol. 5, no. 9, Aug. 2018, pp. 3164-6, doi:10.18203/2349-2902.isj20183741.