A. Zavhorodnii, V. Bilushko, A. Paliy, M. Kalashnyk, N. Kalashnyk, and A. Paliy, “Freeze-Drying Improved the Stability of Tuberculin Purified Protein Derivative (PPD) in Mammals”, Probl Cryobiol Cryomed, vol. 32, no. 1, pp. 63–67, Jun. 2022.