Muscheler R.; Beer J.; Wagner G.; Laj C.; Kissel C.; Raisbeck G.M.; Yiou F.; Kubik P.W.
(2004)
The variations in atmospheric radiocarbon (14C) concentration during the last 50 000 years can be attributed to changes in the 14C production rate (due to changes in solar activity, the geomagnetic field and/or interstellar ...