J. Vogel

INFLUENCE OF DIET AND AGE ON CARBON ISOTOPE RATIOS IN OSTRICH EGGSHELL

J. Vogel, N. V. D. Merwe, Y. V. Schirnding, 1982 .

Recent carbon isotope research and its implications for African archaeology

J. Vogel, N. J. Merwe, 1983 .

Carbon-14 in Methane Sources and in Atmospheric Methane: The Contribution from Fossil Carbon

W. Broecker, J. Southon, R. Fairbanks, 1989, Science.