1. Berners-Lee, T., Handler, J., Lassila, O.: The semantic web. Sci. Am. 284(5), 34–43 (2003)
2. Wang, Y., Wu, Z.: Summarization of research on semantic retrieval system for scientific and technological documents. Mod. Libr. Inf. Technol. 5, 1–7 (2015)
3. Sheng, D., Sun, J.: Research on subject knowledge service based on semantic search engine-taking GoPubMed as an example. Books Inf. Knowl. 4, 113–120 (2015)
4. Nobata, C., Cotter, P., Okazaki, N.: Kleio: a knowledge-enriched information retrieval system for biology. In: the 31st Annual International ACM SIGIR Conference on Research and Development in Information Retrieva (SIGIR ‘08), New York, pp. 787–788 (2008)
5. Allot, A., Peng, Y., Wei, C.: LitVar: A semantic search engine for linking genomic variant data in PubMed and PMC. Nucleic Acids Res. 46(Suppl. 8), 530–536 (2018)