A Comparative Study on Three Integration Systems of Open Access Resources

OA Movement rises in 1990s,now it has brought so many resources to the world,and benefited so many people on research communications or learning from each other.Widely distributed stored resources give a great inconvenience and confusion,while OA resources integration systems are helpful.Some necessary comparative analysis could benefit us better from the OA resources,and give readers better services,and ideas may also be used for library services or collections building.