The article by Mr.H.Dijkstra (corrected spelling, Dykstra is the
American form, but his name is spelt Dijkstra with ij instead of y,
since Mr.H.Dijkstra is Dutch) can also be downloaded via:
https://academic.oup.com/zoolinnean/article/125/4/383/2684286
(and then click on the pdf link).
Best wishes, Erick Staal
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