Kitagawa H. and van der Plicht J., 1998. Atmospheric Radiocarbon Calibration to 45,000 yr BP:
Late Glacial Fluctuations and Cosmogenic Isotope Production. Science 279, p. 1187-1190.
Kitagawa H. and van der Plicht J., 1998. A 40,000-Year Varve Chronology from Lake Suigetsu,
Japan: Extension of the 14C Calibration Curve. Radiocarbon, Vol.40, No.1, 505-515.
Kitagawa, H., and van der Plicht, J., 2000. Atmospheric Radiocarbon Variation beyond 11,900 calBP
from Lake Suigetsu. Radiocarbon Vol., 42, Nr.3. p.369-380.