Menning M.; Belka Z.; Chuvashov B.; Engel B.A.; Jones P.J.; Kullmann J.; Utting J.; Watney L.; Weyer D.
(2001)
The number of global Carboniferous series and stages should be consistent with those of the neighbouring Devonian and Permian systems. Therefore, two series and seven to nine stages are preferred instead of two subsystems, ...