Choudhary, M., R. Soni, M. L. Swarankar, and S. Garg. “Comparison of Vitrification and Slow Freezing for Cryopreservation of Cleavage Stage Embryos (Day 3) and Its Impact on Clinical Outcome”. International Journal of Research in Medical Sciences, vol. 3, no. 10, Jan. 2017, pp. 2751-6, doi:10.18203/2320-6012.ijrms20150826.