Bibtex:
@article {Guzman606,
author = {Guzman, Jorge and Stern, Scott}, title = {Where is Silicon Valley?}, volume = {347}, number = {6222}, pages = {606--609}, year = {2015}, doi = {10.1126/science.aaa0201}, publisher = {American Association for the Advancement of Science}, issn = {0036-8075}, URL = {https://science.sciencemag.org/content/347/6222/606}, eprint = {https://science.sciencemag.org/content/347/6222/606.full.pdf}, journal = {Science}
}