Add more search engine options
Hi there, what would be good is to add more search engine options. Currently there is google scholar and arxiv. But because Citations is an open source project, it would be great to also promote the largest generalist open source search engines (i.e. semantic scholar: https://www.semanticscholar.org/). Sometimes, semantic scholar is also more responsive by integrating faster some new papers than google scholar. Very complementary IMHO. For other suggestions, you can find below a full list of the major search engines from ythe wikipedia page: https://en.wikipedia.org/wiki/List_of_academic_databases_and_search_engines