@article{10_4064_ap_12_2_207_208,
     author = {W. Bach},
     title = {A simple proof of the uniqueness of the extremal measure},
     journal = {Annales Polonici Mathematici},
     pages = {207--208},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1962},
     doi = {10.4064/ap-12-2-207-208},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-12-2-207-208/}
}