Erdős number

I have an Erdős number of 4:

Jiuguang Wang – Magnus B. Egerstedt

Brian S. Smith, Jiuguang Wang, Magnus B. Egerstedt, and Ayanna M. Howard. Automatic Formation Deployment of Decentralized Heterogeneous Multi-Robot Networks with Limited Sensing Capabilities. In 2009 IEEE International Conference on Robotics and Automation, pages 730-735, Kobe, Japan, May 2009.

Magnus B. Egerstedt – Vincent D. Blondel

Magnus B. Egerstedt and Vincent D. Blondel. How Hard Is It To Control Switched Systems? In 2002 American Control Conference, pages 1869 – 1873, Anchorage, Alaska, USA, May 2002.

Vincent D. Blondel – Harold S. Shapiro

Vincent D. Blondel, Rudolf Rupp, and Harold S. Shapiro. On Zero and One Points of Analytic Functions. In Complex Variables and Elliptic Equations, 28:189-192, October 1995

Harold S. Shapiro – Paul Erdős

Paul Erdős, Harold S. Shapiro, and A.L. Shields. Large and Small Subspaces of Hilbert Space. Michigan Math Journal, 12:169-178, 1965