Burlaka, B. S., and I. F. Bielenichev. “A Study on Toxicity, Local Irritative Effect of and Allergic Response to a Novel Intranasal Medication Containing N-Phenylacetyl-L-Prolylglycine Ethyl Ester”. Zaporozhye Medical Journal, vol. 23, no. 1, Apr. 2021, pp. 126-31, doi:10.14739/2310-1210.2021.1.224929.