Analysis highlights ongoing complexity in DOIs and URLs, suggesting challenges in persistent identifiers.
This is a long overdue followup to 2016's "URLs and DOIs: a complicated relationship". Like that post, this accompanies my talk at PIDapalooza, the festival of open persistent identifiers). I don't think I need to give a spoiler warning when I tell you that it's still complicated.
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Joe Wass (2019) studied this question.
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