“DEVELOPMENT AND DIFFERENTIATION OF KERATINIZED ORAL ARMATURE UNDER THE INFLUENCE OF VITAMIN A IN Bufo melanostictus STAGE 34 AND 36”, J. Sci. Innov. Nat. Earth, vol. 1, no. 4, pp. 04–08, Nov. 2021, doi: 10.59436/jsiane.v1i4.133.2583-2093.