We've had to block your IP address :-(

Hello. We're delighted that you are using our services and we hope you find them useful.

You were sent here from Crossref REST API

Unfortunately, your usage seems to be causing some problems with the API, which, in turn, is preventing other users from accessing it as well. As such, we have temporarily blocked your access. Please contact us at support@crossref.org so we can unblock you as quickly as possible. Please include your IP address and tell us if you are a Metadata Plus user.

We don't like having to block IP addresses and we'd be happy to help you optimize your system to make the best, unobtrusive use of our API.

And do take a look at the etiquette section of our API documentation for more tips on using the system "politely".