1. Chen C. Pregnancy after human oocyte cryopreservation. Lancet 1986;1:884-886.
2. van Uem JF, Siebzehnrübl ER, Schuh B, Koch R, Trotnow S, Lang N. Birth after cryopreservation of unfertilized oocytes. Lancet 1987;1:752-753.
3. Lee DR, Yoon TK. Effect of slush-nitrogen on the cryopreservation of oocytes and embryos using vitrification. Korean J Reprod Med 2009;36:1-7.
4. Moller CC, Wassarman PM. Characterization of a proteinase that cleaves zona pellucida glycoprotein ZP2 following activation of mouse eggs. Dev Biol 1989;132:103-112.
5. Mavrides A, Morroll D. Bypassing the effect of zona pellucida changes on embryo formation following cryopreservation of bovine oocytes. Eur J Obstet Gynecol Reprod Biol 2005;118:66-70.
6. Vincent C, Pickering SJ, Johnson MH. The hardening effect of dimethylsulphoxide on the mouse zona pellucida requires the presence of an oocyte and is associated with a reduction in the number of cortical granules present. J Reprod Fertil 1990;89:253-259.
7. Sathananthan AH, Ng SC, Trounson AO, Bongso A, Ratnam SS, Ho J, et al. The effects of ultrarapid freezing on meiotic and mitotic spindles of mouse oocytes and embryos. Gamete Res 1988;21:385-401.
8. Hotamisligil S, Toner M, Powers RD. Changes in membrane integrity, cytoskeletal structure, and developmental potential of murine oocytes after vitrification in ethylene glycol. Biol Reprod 1996;55:161-168.
9. Bos-Mikich A, Wood MJ, Candy CJ, Whittingham DG. Cytogenetical analysis and developmental potential of vitrified mouse oocytes. Biol Reprod 1995;53:780-785.
10. Le Gal F, Massip A. Cryopreservation of cattle oocytes: effects of meiotic stage, cycloheximide treatment, and vitrification procedure. Cryobiology 1999;38:290-300.
11. Stachecki JJ, Willadsen SM. Cryopreservation of mouse oocytes using a medium with low sodium content: effect of plunge temperature. Cryobiology 2000;40:4-12.
12. Stachecki JJ, Cohen J, Willadsen SM. Cryopreservation of unfertilized mouse oocytes: the effect of replacing sodium with choline in the freezing medium. Cryobiology 1998;37:346-354.
13. Wilmut I. The effect of cooling rate, warming rate, cryoprotective agent and stage of development on survival of mouse embryos during freezing and thawing. Life Sci II 1972;11:1071-1079.
14. Leibo SP, Mazur P. In: Daniel JC, editor. Methods for the preservation of mammalian embryos by freezing. Methods in mammalian reproduction. 1978. New York: Academic Press; p. 179-201.
15. Tucker M, Wright G, Morton P, Shanguo L, Massey J, Kort H. Preliminary experience with human oocyte cryopreservation using 1,2-propanediol and sucrose. Hum Reprod 1996;11:1513-1515.
16. Porcu E, Fabbri R, Seracchioli R, Ciotti PM, Magrini O, Flamigni C. Birth of a healthy female after intracytoplasmic sperm injection of cryopreserved human oocytes. Fertil Steril 1997;68:724-726.
17. Quintans CJ, Donaldson MJ, Bertolino MV, Pasqualini RS. Birth of two babies using oocytes that were cryopreserved in a choline-based freezing medium. Hum Reprod 2002;17:3149-3152.
18. Yoon TK, Kim TJ, Park SE, Hong SW, Ko JJ, Chung HM, et al. Live births after vitrification of oocytes in a stimulated in vitro fertilization-embryo transfer program. Fertil Steril 2003;79:1323-1326.
19. Yoon TK, Lee DR, Cha SK, Chung HM, Lee WS, Cha KY. Survival rate of human oocytes and pregnancy outcome after vitrification using slush nitrogen in assisted reproductive technologies. Fertil Steril 2007;88:952-956.
20. Lee DR, Yang YH, Eum JH, Seo JS, Ko JJ, Chung HM, et al. Effect of using slush nitrogen (SN2) on development of microsurgically manipulated vitrified/warmed mouse embryos. Hum Reprod 2007;22:2509-2514.
21. Zhu SE, Sakurai T, Edashige K, Machida T, Kasai M. Cryopreservation of zona-hatched mouse blastocysts. J Reprod Fertil 1996;107:37-42.
22. Sommerfeld V, Niemann H. Cryopreservation of bovine in vitro produced embryos using ethylene glycol in controlled freezing or vitrification. Cryobiology 1999;38:95-105.
23. Emiliani S, Van den Bergh M, Vannin AS, Biramane J, Englert Y. Comparison of ethylene glycol, 1,2-propanediol and glycerol for cryopreservation of slow-cooled mouse zygotes, 4-cell embryos and blastocysts. Hum Reprod 2000;15:905-910.
24. Martino A, Songsasen N, Leibo SP. Development into blastocysts of bovine oocytes cryopreserved by ultra-rapid cooling. Biol Reprod 1996;54:1059-1069.
25. Mukaida T, Nakamura S, Tomiyama T, Wada S, Oka C, Kasai M, et al. Vitrification of human blastocysts using cryoloops: clinical outcome of 223 cycles. Hum Reprod 2003;18:384-391.
26. Vajta G, Holm P, Greve T, Callesen H. Comparison of two manipulation methods to produce in vitro fertilized, biopsied and vitrified bovine embryos. Theriogenology 1997;47:501-509.
27. Yoon TK, Lee DR, Cha KY. In: Tucker M, Liemermann J, editors. Vitrification of oocytes using gold grid and slush nitrogen. Vitrification in assisted reproduction: a user's manual and trouble-shooting guide. 2007. London: Informa Healthcare; p. 145-151.
28. Isachenko V, Alabart JL, Nawroth F, Isachenko E, Vajta G, Folch J. The open pulled straw vitrification of ovine GV-oocytes: positive effect of rapid cooling or rapid thawing or both? Cryo Letters 2001;22:157-162.
29. Cocchia N, Ciani F, Russo M, El Rass R, Rosapane I, Avallone L, et al. Immature cat oocyte vitrification in open pulled straws (OPSs) using a cryoprotectant mixture. Cryobiology 2010;60:229-234.
30. Kuwayama M, Vajta G, Kato O, Leibo SP. Highly efficient vitrification method for cryopreservation of human oocytes. Reprod Biomed Online 2005;11:300-308.
31. Park JK, Go YE, Eum JH, Won HJ, Lee WS, Yoon TK, et al. Effect on survival and developmental competence of vitrified mouse embryos using various cryoprotectants and cooling speeds. Korean J Reprod Med 2010;37:307-319.
32. Kim EK, Son WY, Chi HJ, Ko JJ, Yoon TK, Cha KY. Cryopreservation of human immature follicular oocytes. Korean J Fertil Steril 1992;19:163-168.
33. Boiso I, Marti M, Santalo J, Ponsa M, Barri PN, Veiga A. A confocal microscopy analysis of the spindle and chromosome configurations of human oocytes cryopreserved at the germinal vesicle and metaphase II stage. Hum Reprod 2002;17:1885-1891.