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By: Ahlberg, Per ErikType: ArticleIn: PalaeontologyVolume: 32Series:Issue:Date: 1989Page Range: 553--570Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Ahlberg, Per ErikType: ArticleIn: PalaeontologyVolume: 35Series:Issue:Date: 1992Page Range: 813--828Publication Info: London, Palaeontological Association, 1957-Subjects:
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By: Ahlberg, Per ErikType: ArticleIn: PalaeontologyVolume: 38Series:Issue:Date: 1995Page Range: 259--285Publication Info: London, Palaeontological Association, 1957-Subjects: