Agrali,B. et al. (1967)
Palynologic study of the coals of Hazro and estimation of the age of lacustrine horizons of the Permian-Carboniferous. [ Hazro kжmмrlerinin palinolojik incelenmesi ve Permo-Karboniferdeki gжlsel horizonlarin yasi hakkinda dмsмnceler. ] Bulletin of the Mineral Research and Exploration Institute of Turkey,(Maden Tektik ve Arama Institut,Mecmuasi,Bulletin)
Vol. 68 P. 1- 26