MathSciNet bibliographic data MR1986821 11N25 (11A25) Holt, Jeffrey J. The minimal number of solutions to $\phi(n)=\phi(n+k)$$\phi(n)=\phi(n+k)$. Math. Comp. 72 (2003), no. 244, 2059–2061. Article

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.