Improved convergence theorems for bubble clusters. I. The planar case Marco CicaleseGian Paolo LeonardiFrancesco Maggi Indiana University Mathematics Journal 2016 text pdf 10.1512/iumj.2016.65.5932 10.1512/iumj.2016.65.5932 en Indiana Univ. Math. J. 65 (2016) 1979 - 2050 state-of-the-art mathematics http://iumj.org/access/