@article{COCV_2018__24_3_1303_0,
     author = {Paolini, Emanuele and Tamagnini, Andrea},
     title = {Minimal clusters of four planar regions with the same area },
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {1303--1331},
     publisher = {EDP-Sciences},
     volume = {24},
     number = {3},
     year = {2018},
     doi = {10.1051/cocv/2017066},
     zbl = {1411.53013},
     mrnumber = {3877203},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv/2017066/}
}