Reference health
The cladistic solution to the species problem
18/18 checkable references clean · checked 2026-08-08
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a retraction, withdrawal, or removal notice.
6 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 18 checked references that resolve
resolves10.1093/bjps/XV.60.314
THE EFFECT OF ESSENTIALISM ON TAXONOMY—TWO THOUSAND YEARS OF STASIS (I)
The 6 references without a DOI — listed, not checked
no DOI — not checkedHennig, W.: 1966, Phylogenetic systematics, University of Illinois Press, Urbana.
no DOI — not checkedMaynard Smith, J.: 1986, The problems of biology, Oxford University Press, Oxford.
no DOI — not checkedNelson, G. & N. I. Platnick: 1981, Systematics and biogeography, Columbia University Press, New York.
no DOI — not checkedPaterson, H. E. H.: 1978, ‘More evidence against speciation by reinforcement’, South African journal of science 74, 369–371.
no DOI — not checkedPaterson, H. E. H.: 1985, ‘The recognition concept of species’. In E. S. Vrba (ed.), Species and speciation. Transvaal Museum Monograph, no. 4, Transvaal Museuum, Pretoria, p. 21–29.
no DOI — not checkedRidley, M.: 1986, Evolution and classification: the reformation of cladism, Longman, London.
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work were clean at the dated check: each resolved to a known work in a public registry, and none
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or importance of the work itself, and nothing about references deposited without a DOI.
checked 2026-08-08 — re-checked daily as this page is visited; titles and statuses come from Crossref and DataCite and are not part of the signed record
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