%0 Journal Article %A Paolini, Emanuele %A Tamagnini, Andrea %T Minimal clusters of four planar regions with the same area %J ESAIM: Control, Optimisation and Calculus of Variations %D 2018 %P 1303-1331 %V 24 %N 3 %I EDP-Sciences %U http://www.numdam.org/articles/10.1051/cocv/2017066/ %R 10.1051/cocv/2017066 %G en %F COCV_2018__24_3_1303_0