Prokopets, Vadim, Oleksandr Zdoryk, and Viktoria Georgiyants. “Development and Standardization of Test Systems Based on Filter Paper and Modified With Vanillin Reagent”. ScienceRise: Pharmaceutical Science, no. 4 (8) (August 31, 2017): 46–50. Accessed December 20, 2024. https://journals.uran.ua/sr_pharm/article/view/109254.