N. Youssef, B. Markert, E. Gurbanov, H. Sevnic, and S. Wünschmann, “Bioindication of trace metal pollution in the atmosphere of Baku city using ligustrum japonicum, olea europea, and pyracantha coccinea leaves”, JEELM, vol. 22, no. 1, pp. 14-20, Mar. 2014.