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Modification of the Neurocranium in Zygaena malleus and the Nature of the Optic Stalk in Selachii. Nature, 187(4733), 257–258
DOI: 10.1038/187257b0
Studies on the head skeleton of Rhinobatus halavi, Rhynchobatus djiddensis and Trygon kuhlii. Publications of the Marine Biological Station of Al–Ghardaqa, 10, 3–40