1. Kempe S., Mitt. Geol.-Palaeontol. Inst. Univ. Hamburg 52, 719 (1982).
2. Frankignoulle M., Bourge I., Wollast R., Limnol. Oceanogr. 41, 365 (1996).
3. P. M. Woodwell P. H. Rich C. A. S. Hall in Carbon and the Biosphere P. M. Woodwell and E. V. Pecan Eds. (U.S. National Technical Information Service Springfield VA 1973) pp. 221–240.
4. Kempe S., J. Geophys. Res. 89, 4657 (1984).
5. R. Wollast in Pollution of the North Sea An Assessment W. Salonmons B. L. Baynes E. K. Duursma U. Förstner Eds. (Springer-Verlag Berlin 1988) pp. 185–193.