Spores and pollen of Lower Carboniferous deposits of the Western extension of the Donetz Basin and their values for stratigraphy.
Reference:
Ishchenko,A.M. (1956)
Spores and pollen of Lower Carboniferous deposits of the Western extension of the Donetz Basin and their values for stratigraphy. Publishing House Academy of Sciences of the USSR, Kiev.Stratigraphicaleontologic Series (Translation )
Vol. 11 P. 1- 187