Vysekantsev, I. P., E. A. Omelchenko, and T. M. Gurina. “Study of Microorganisms’ Viability and Integrity of Structural Sites of Their DNA, Amplified in PCR After Low-Temperature Storage under Different Conditions”. Problems of Cryobiology and Cryomedicine, no. 1, May 2003, pp. 71-75, http://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/1013.