Cenograms were introduced in the publication Terre et Vie.
Notes on verification
Confirmed by multiple independent academic sources, including the primary source itself (Valverde 1964, La Terre et La Vie, vol. 18, issue 2, pp. 121-154) accessed via Persée archive. [tier=gold indep_score=0.983 clusters=3 claim_tier=notable]
Sources
- Cenogram (wikipedia)
- https://www.sciencedirect.com/science/article/abs/pii/S0031018208006299 (corroboration)
- https://link.springer.com/chapter/10.1007/978-3-319-94265-0_2 (corroboration)
- https://www.persee.fr/doc/revec_0040-3865_1964_num_18_2_4401 (corroboration)