Sengupta, S., S. Pal, B. K. Biswas, S. Chakrabarti, K. Bose, and S. Jana. “Collision Tumor of Ovary: A Rare Combination of Dysgerminoma and Serous Cystadenocarcinoma”. Bangladesh Journal of Medical Science, vol. 13, no. 2, Mar. 2014, pp. 224-7, doi:10.3329/bjms.v13i2.14955.