AGHABABAEYAN, E., M. PAKRAVAN, and F. GHAHREMANINEJAD. “Anatomical Study and Pollen Micromorphology of Onopordum L. In Iran”. Notulae Scientia Biologicae, vol. 6, no. 1, Mar. 2014, pp. 66-76, doi:10.15835/nsb619226.