Back in March, we announced the beta release of the CORE API v2. This added new features such as searching via DOI and retrieving citations for full texts.
This new API should be more reliable and have a higher quality metadata output compared to the old version.
Over the next few months, we aim to finalise the API v2 and finally close access to v1. The scheduled date of the v1 switch off is Monday, 25th April 2016.
We hope that most users have already had an opportunity to test v2 of the API but if not, we suggest that you check out the documentation here.