Köksal, E. A., B. Asci, and N. M. Pinar. “A Comparison of Pollen Grains of Potentilla Recta L. (Rosaceae) Groups A, B & C in Turkey”. Bangladesh Journal of Plant Taxonomy, vol. 17, no. 1, June 2010, pp. 93-96, doi:10.3329/bjpt.v17i1.5395.