@article{MZ_1982__180_173169,
     author = {Glenn Schober and William E. Kirwan},
     title = {New {Inequalities} from {Old} {Planes.}},
     journal = {Mathematische Zeitschrift},
     pages = {19--40},
     publisher = {mathdoc},
     volume = {180},
     year = {1982},
     zbl = {0498.30024},
     url = {http://geodesic.mathdoc.fr/item/MZ_1982__180_173169/}
}