Hind A. Al-Zahrani, Amr A. El-Waseif, and Dina E. El-Ghwas, “Biosynthesis and evaluation of TiO2 and ZnO nanoparticles from in vitro stimulation of Lactobacillus johnsonii”, J Inn Pharm Bio Sci, vol. 5, no. 1, pp. 16–20, Jan. 2018.