Per completare le informazioni sui numeri DOI, resta da sapere chi li assegna. L'informazione è presente nella pagina web della Baylor Library
"Some articles won't have a DOI. The DOI system is a fairly recent concept. For example, the International DOI Foundation was founded in 1998 and the publisher Elsevier appears to have started using DOIs on all of their journal articles around 2003. So unless a publisher has retrospectively assigned DOIs to articles, articles published prior to 2000 are less likely to have DOIs"
http://www.baylor.edu/lib/electrres/index.php?id=49231
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