@article{MAN_1994__299_4_165230,
     author = {Frank Morgan},
     title = {Clusters minimizing area plus length of singular curves.},
     journal = {Mathematische Annalen},
     pages = {697--714},
     publisher = {mathdoc},
     volume = {299},
     number = {4},
     year = {1994},
     zbl = {0805.49025},
     url = {http://geodesic.mathdoc.fr/item/MAN_1994__299_4_165230/}
}