Cenograms were introduced in 1964 by J.A. Valverde.
Notes on verification
Confirmed by multiple independent peer-reviewed academic sources (ScienceDirect, Springer) citing Valverde's 1964 publication in La Terre et la Vie as the origin of the cenogram method. [tier=silver indep_score=0.77 clusters=2 claim_tier=notable]
Sources
- Cenogram (wikipedia)
- https://www.sciencedirect.com/science/article/abs/pii/S0031018208006299 (corroboration)
- https://sciencedirect.com/science/article/abs/pii/S0016699507000794?via=ihub%3D (corroboration)
- https://www.sciencedirect.com/science/article/abs/pii/S0031018210002312 (corroboration)
- https://link.springer.com/article/10.1007/BF02436623 (corroboration)