Dimeska, Gordana, and Gordana Bilbiloska. “Mitotic Index and Pollen Viability of Helianthus Annuus l., After Treatment With Pb(NO3)2”. Macedonian Journal of Ecology and Environment 19, no. 1-2 (December 31, 2017): 22–27. Accessed July 20, 2024. http://mjee.org.mk/index.php/mjee/article/view/114.