Grandjean, P. & Cappetta, H. & Albarede, F. (1988)
The REE and eND of 40-70 Ma old fish debris from the West-African Platform. Geophysical Research Letter, 15(4), 389–392

Grandjean, P. & Cappetta, H. & Michard, A. & Albarede, F. (1987)
The assessment of REE patterns and 143 Nd/144 Nd ratios in fish remains. Earth and Planetary Science Letters, 84(2/3), 181–196
DOI: 10.1016/0012-821X(87)90084-7