In reply to a post on twitter.com
@jtbach2010 @CrossrefOrg Hi. We've deprecated using Search as an API for a few years now and are finally sunsetting it, Our REST API has a lot more functionality and scales better. So, equivalent is http://api.crossref.org/works/10.1002/9780470294178.ch5 Documentation for the API is at https://api.crossref.org . Hope this helps