@article{AUCMP_2005__46_2_a12,
     author = {Trigos-Arrieta, F. Javier and Turza\'nski, Marian},
     title = {On {Aumann's} theorem that the circle does not admit a mean},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {77--82},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {2005},
     mrnumber = {2194049},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_2005__46_2_a12/}
}