Venkatachala, B.S., and D.C. Bharadwaj. “Sporological Study of the Coals from Falkenberg (Faulouemont) Colliery, Lothringen (Lorrain), France”. Journal of Palaeosciences 11, no. (1-3) (December 31, 1962): 159–207. Accessed May 21, 2024. https://www.jpsonline.co.in/index.php/jop/article/view/637.