1. Les datations par le 14C des matières organiques des sols;Balesdent;Sci. Sol,1982
2. Mass spectrometric studies of carbon-13 variations in corn and other grasses;Bender;Radiocarbon,1968
3. Characteristics of neotropical paramo vegetation and its subantarctic relations;Cleef;Erdwiss. Forsch.,1978
4. Paramo vegetation and its life forms;Cuatrecasas,1958
5. The isotopic composition of reduced organic carbon;Deines,1980