Every reference with a DOI in the deposited reference list resolved to a known
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Lower Permian Insects From OklahomaPart 2. Orders Ephemeropteraand Palaeodictyoptera
The 6 references without a DOI — listed, not checked
no DOI — not checkedBoy, J. A. (1972): Die Branchiosaurier (Amphibia) des saarpfälzischen Rotliegenden (Perm, SW-Deutschland). — Abh. hess. L.-Amt Bodenforsch.,65, Wiesbaden.
no DOI — not checkedKinzelbach, R. (1970): Eine fossile Eintagsfliege aus dem Perm des Saar-Nahe-Pfalz-Gebietes (Ephemeroptera: Permoplectoptera: Misthodotidae (TlLLYARD 1932). — Mainzer naturw. Arch.,9: 318–322; Mainz.
no DOI — not checkedKukalova, J. (1968): Permian mayfly nymphs. — Psyche,75: 320–327; Lexington/Mass.
no DOI — not checkedSchultheiss, K. (1979): Ein bemerkenswerter Insektenrest aus dem Rotliegenden des Saar-Nahe-Bek-kens. — Westricher Heimatblätter,10 (3): 126–127; Kusel.
no DOI — not checkedTchernova, O. A. (1965): Some fossil mayflies (Ephemeroptera, Misthodotidae) from Permian-beds of the Ural. — Rev. Ent. USSR,44 (2): 253–361; Moskau.
no DOI — not checkedTILLYARD, R. J. (1932): Kansas Permian insects. Part. 15. The order Plectoptera. — Am. J. Sci. (5)23: 98–134, 237-272; New Haven/Conn.
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