Semantic Scholar This link opens in a new window"A free, AI-powered academic search engine. Semantic Scholar covers all STM and SSH disciplines including biology, medicine, computer science, geography, business, history, and economics. Nearly 200 million papers are sourced from 550+ partners such as PubMed, Springer Nature, Taylor & Francis, SAGE, Wiley, ACM, IEEE, arXiv, Microsoft Academic, and Unpaywall." If you run into a paywall, ask your librarians how to get the article for free!