Pantano, T., M. R. B. de Mello, J. F. Garcia, L. L. Ho, and J. A. Visintin. “Effects of Cryoprotectant and Plunging Temperature in Liquid Nitrogen on the in Vitro and in Vivo Development of Murine Morulae”. Brazilian Journal of Veterinary Research and Animal Science, vol. 37, no. 3, Jan. 2000, pp. 243-8, doi:10.1590/S1413-95962000000300012.