Title Main topics of talk The Open Citation Project OpCit - who we are The Open Archives Initiative OAi services Linking arXiv physics archives Linked references (and access to demo) Early linking demo: how many references linked? Reference linking: expectations and constraints How to improve reference linking Next steps for the demo Tools for reference linking Integrating linking services Cornell DLRG approach to reference linking An architecture for reference analysis The reference linking API The API: various specifications Overall reference linking architecture Next steps for the reference linking API An interface for author submissions - Eprints Conclusion