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.
The 16 references without a DOI — listed, not checked
no DOI — not checkedDarlington, C. D. and Wylie, A. P., Chromosome Atlas of flowering plants. London, 1955: 20–21.
no DOI — not checkedKidney, A. E. J. B., Delphinium species and “West o'the Rockies” strain. Delph. Soc. Year Book, London, 1958: 105–106.
no DOI — not checkedLegro, R. A. H., Soortskruisingen bij Delphinium. Genen en Phaenen 3 (1958): 69–72.
no DOI — not checkedLewis, H. and Epling, C., Delphinium gypsophilum, a diploid species of hybrid origin. Evolution 13 (1959): 511–525.
no DOI — not checkedMehlquist, G. A. L., The reaction of thirteen California species of Delphinium to powdery mildew. Proc. Am. Soc. Hort. Sc. 39 (1941): 411–413.
no DOI — not checkedPropach, H., Einige Chromosomenzahlen von Delphinien und ihre Auswertung für die Entstehung der Gartenformen Gartenbauwiss. 14 (1940): 642–650.
no DOI — not checkedReinelt, F., Giant Pacific Delphiniums-A trilogy, I. Delph. Soc. Year Book, London, 1956: 82–84.
no DOI — not checkedReinelt, F., The history of the Pacific strain of Delphinium. Delph. Soc. Year Book, London, 1958: 135–141.
no DOI — not checkedRoyal horticultural society, A tentative check-list of Delphinium names. London, 1949: 1–112.
no DOI — not checkedRuys, J. D., Veredelingswerk bij vaste planten. Erf. in praktijk 11 (1950)4: 1–3.
no DOI — not checkedSamuelson, A. A., Wild Delphiniums and their hybrids. Delph. Soc. Year Book, London, 1957: 101–112.
no DOI — not checkedSamuelson, A. A., “Golden-hued pastures”. Delph. Soc. Year Book, London, 1959: 117–128.
no DOI — not checkedSamuelson, A. A., The wild scarlet-flowered Delphinium. Delph. Soc. Year Book, London, 1960: 9–19.
no DOI — not checkedSteichen, H., My half-century of Delphinium breeding. Delph. Soc. Year Book, London, 1959: 9–21.
no DOI — not checkedWerckmeister, P., Möglichkeiten und Wege der Farbenzüchtung. Gartenwelt, 52 (1953): 259–260; 281–282.
no DOI — not checkedWilde, E. I., Studies of the genus Delphinium. Bull. Cornell Univ. Agric. Exp. St., Ithaca, N.Y. 519 (1931): 1–106.
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