Thomas Martinetz Amir Madany Mamlouk Cicero Mota Fast and Easy Computation of Approximate Smallest Enclosing Balls. 163-170 2006 conf/sibgrapi/2006 SIBGRAPI http://doi.ieeecomputersociety.org/10.1109/SIBGRAPI.2006.20 db/conf/sibgrapi/sibgrapi2006.html#MartinetzMM06