MathSciNet bibliographic data MR2072849 05C80 Sarnak, Peter What is\$\dots\$$\dots$an expander? Notices Amer. Math. Soc. 51 (2004), no. 7, 762–763. Journal

For users without a MathSciNet license , Relay Station allows linking from MR numbers in online mathematical literature directly to electronic journals and original articles. Subscribers receive the added value of full MathSciNet reviews.