1. With the literature retrieval services provided by public databases such as Google Academic, PubMed and ScienceDirect, users can easily search for the literature information they need.
2. Some commercial novelty retrieval institutions, such as Elsevier and ClarivateAnalytics, also provide fast literature retrieval and reporting services, but they need to pay a certain fee.
3. There are also some companies and institutions specializing in literature retrieval and research, such as Questel, InnovationIntelligence, Relecura, etc. , it can also provide relatively fast and comprehensive reporting services.