Citations total:
link From To Geolocation Author - title Year
original Early Namurian Poland Ishchenko,A.M. et al. Megaspores of the Carboniferous age and their stratigraphic importance 1962
details Carboniferous USSR Oshurkova,M.V. The classification of Carboniferous megaspores. (Taxonomy and Methods for the Study of Fossl Pollen and Spores. V.N. Saks and A.F. Khlonova, editors) 1964