Preservation of viability and biological properties of S. Aureus and P. Aeruginosa after 3 years' storage under –196°C - I. P. Vysekantsev; S. V. Koshchij; E. V. Kudokotseva; O. V. Shapovalova; O. N. Belokon (Problems of cryobiology and cryomedicine, 2003)