Travlos, I.S., G. Economou, S. Tsioros and P. Kanatas (2013). Interference of common cocklebur (Xanthium strumarium L.) and spiny cocklebur (Xanthium spinosum L.) with tobacco (Nicotiana tabacum). Proceedings of 16th EWRS Symposium, p. 73, 24-27 June 2013, Samsun, Turkey.