Stirbu, S., Thirion, P., Schmitz, S., Haesbroeck, G., & Greco, N. (13 May 2015). The utility of Google Scholar when searching geographical literature: comparison with three commercial bibliographic databases.
Journal of Academic Librarianship, 41 (3), 322-329. doi:10.1016/j.acalib.2015.02.013
https://hdl.handle.net/2268/178974