Zhang, H., S. K. Arhin, J. Zhao, X. Hou, Y. Chen, and Z. Huang. “Delayed Development Influences the Outcome of Different Grades of D5 and D6 Blastocysts During freeze–thaw Cycle”. Cellular and Molecular Biology, vol. 65, no. 4, Apr. 2019, pp. 1-5, doi:10.14715/cmb/2019.65.4.1.