Science Direct fetcher is broken

[stefan-kolb]

URL no longer available inside id=pdfLink
http://www.sciencedirect.com/science/article/pii/0370269377900156?via%3Dihub
Only new design? Some articles?
This one still works:
http://www.sciencedirect.com/science/article/pii/S1674775515001079

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We use the Elsevier API for getting the Sciencedirect web page link and then scrape the web page for the deep link.