Hordiei, K. R., T. M. Gontova, and S. P. Mashkovska. “Comparative Morphological and Anatomical Analysis of the Feverfew Herb Varieties Phlora Pleno and White Gem”. Farmatsevtychnyi Zhurnal, no. 4, Aug. 2021, pp. 90-102, doi:10.32352/0367-3057.4.21.08.