Bernhard Fuchs Walter Kern Xinhui Wang The Number of Tree Stars Is <i>O</i> <sup>*</sup>(1.357<sup> <i>k</i> </sup>). 232-244 2007 49 Algorithmica 3 http://dx.doi.org/10.1007/s00453-007-9020-y db/journals/algorithmica/algorithmica49.html#FuchsKW07