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Obruchev, D. V. (1953). Studies on edestids and the works of A.P. Karpinski // U.S.S.R. Acad. Sci., works of the Palaeont. Inst. 45: 1-86.

Obruchev, D. V. (1962). Subclass Holocephali // Biostratigraphy of the Paleozoic of the Sayn-Altai mountainous region - Trans. Siberian Sci.-Res. Inst. on Geol., Geoph. and Min. Resources 3(21): 75-76, 213-215.

Obruchev, D. V. (1964). Subclass Holocephali (Chimaeras). Fundamentals of Palaeontology. D. V. Obruchev, Acad. Nauk SSSR. XI: Agnatha, Pisces: 238-266.

Obruchev, D. V. (1967). Fossil chimaera egg capsules // International Geology Review 9(4): 567-573.

Okazaki, Y. (1991). A Fossil Dental Plate of Chimaeroid (Pisces: Holocephali) from the Oligocene Ashiya Group, Kyushu, Japan // Bull. Kitakyushu Mus. Natur. Hist. 10: 105-107. [in Japanese, with English abstract]

Orvig, T. (1962). Y a-t-il une relation directe entre les arthrodires ptyctodontides et les holocephales? // Problems actuels de Paleontologie (Evolution des Vertebres). Int. C.N.R.S. Paris 104: 49-61.

Orvig, T. (1967). Phylogeny of tooth tissues: evolution of some calcified tissues in early vertebrates // Structural and Chemical Organization of Teeth. A. E. W. Miles. New York, Academic Press. 1: 45-110.

Orvig, T. (1976). Paleohistological notes 4. The interpretation of osteodentine, with remarks on the dentition in the Devonian dipnoan Griphognathus // Zool. Scripta 5: 79-96.

Orvig, T. (1980). Histologic studies of ostracoderms, placoderms and fossil elasmobranchs. 3. Structure andgrowth of the gnathalia of certain arthrodires // Zool. Scripta, 9: 141-159.

Orvig, T. (1985). Histologic Studies of ostracoderms, placoderms and fossil elasmobranch. 5. Ptyctodontid tooth plates and thier bearing on holocephalan ancestry; the condition of chimaeroids // Scripta Zool., 14: 55-79.

Owen, R. (1845). Odontography // 64.

Owen, R. (1854). Descriptive Catalogue of the Fosils Organic Remains of Reptilia and Pisces contained in the Museum of the Royal Colleg of Surgeons of England // 142.

Owen, R. (1861). Paleontology // 137.