@article{10_4064_cm129_1_9,
     author = {Rupert Lasser and Josef Obermaier},
     title = {Strongly invariant means on commutative hypergroups},
     journal = {Colloquium Mathematicum},
     pages = {119--131},
     publisher = {mathdoc},
     volume = {129},
     number = {1},
     year = {2012},
     doi = {10.4064/cm129-1-9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm129-1-9/}
}