Repin, N. V.; Marchenko, L. N.; Govorukha, T. P.; Mikhailova, I. P.; Manchenko, A. A.; Sandomirsky, B. P. Ultrastructure of Porcine Pericardium and Aortic Valve Tissues, Devitalized With Cryogenic and Irradiation Exposures. Probl Cryobiol Cryomed 2015, 25, 246-254.