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References
- ↑ Walker, Elaine F. (January 1985). "Arthropod ichnofauna of the Old Red Sandstone at Dunure and Montrose, Scotland" . Transactions of the Royal Society of Edinburgh: Earth Sciences. Cambridge University Press. 76 (2–3): 287–297. doi:10.1017/S0263593300010506. S2CID 131281292 . Retrieved 14 January 2013.
- ↑ Mateus, O., & Milàn, J. 2010. A diverse Upper Jurassic dinosaur ichnofauna from central‐west Portugal. Lethaia, 43(2), 245-257.