J. B. Archer, D. Skevington; The morphology and systematics of 'Didymograptus' spinosus Ruedemann, 1904, and allied species from the Lower Ordovician. Geological Magazine ; 110 (1): 43–53. doi:
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Graptolite, 'D.' spinosus redescribed and referred to Holmograptus, synonymy, first European occurrence (Ireland)
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