@article{{MRA}{}, author = {Jahanfar, S.}, title = { Reproductive Life Events of Twins with Opposite Sex}, journal = {Medical Research Archives}, volume = {6}, number = {2}, year = {2018}, doi = {10.18103/mra.v6i2.1681}, url = {https://esmed.org/MRA/mra/article/view/1681} }