Erin W. Chambers Sándor P. Fekete Hella-Franziska Hoffmann Dimitri Marinakis Joseph S. B. Mitchell Venkatesh Srinivasan Ulrike Stege Sue Whitesides Connecting a Set of Circles with Minimum Sum of Radii. 183-194 2011 WADS http://dx.doi.org/10.1007/978-3-642-22300-6_16 conf/wads/2011 db/conf/wads/wads2011.html#ChambersFHMMSSW11