Cryopreservation of Production Strains of Probiotics Bifidobacterium Bifidum 1 and Lactobacillus Bulgaricus 1Z 03501 in Different Cryoprotective Media - A. E. Ananina; A. V. Shcheglov; I. P. Vysekantsev (Problems of cryobiology and cryomedicine, 2012)