@article{CMH_1985__60_140011,
     author = {Dirk Ferus and Hermann Karcher},
     title = {Non-rational minimal spheres and minimizing cones.},
     journal = {Commentarii mathematici Helvetici},
     pages = {247--269},
     year = {1985},
     volume = {60},
     zbl = {0566.53052},
     url = {http://geodesic.mathdoc.fr/item/CMH_1985__60_140011/}
}