J.M.J. Vergoossen (1992) “On complex dermal elements in Loganellia species (Agnatha, Thelodonti) from the Upper Llandovery of Scotland (l.G.C.P. 328 Contribution)”, Netherlands Journal of Geosciences, 71, pp. 51-64. Available at: https://njgjournal.nl/index.php/njg/article/view/12530 (Accessed: 2April2026).