Kósa, D., Pető, Ágota, Fehér, P., Vecsernyés, M., Bácskay, I. and Ujhelyi, Z. 2021. Challenges of Oral Protein Administration. Acta Pharmaceutica Hungarica. 91, 3-4 (Nov. 2021), 262-263. DOI:https://doi.org/10.33892/aph.2021.91.262-263.