Saltovsky, A. V. “Application of Local Hypothermia for Induced Abortion in 2nd Trimester”. Problems of Cryobiology and Cryomedicine, vol. 15, no. 4, Dec. 2005, pp. 700-5, http://journal.cryo.org.ua/index.php/probl-cryobiol-cryomed/article/view/1222.