@article{EJDE_2014__2014__a18,
     author = {Mohammadi,  Abbasali and Yousefnezhad,  Mohsen},
     title = {Optimal ground state energy of two-phase conductors},
     journal = {Electronic journal of differential equations},
     year = {2014},
     volume = {2014},
     zbl = {1296.49044},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a18/}
}