@article{MOMA_1996__121_3_178711,
     author = {Alexander Durner},
     title = {On {Averaging} {Multisets.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {41--54},
     publisher = {mathdoc},
     volume = {121},
     number = {3},
     year = {1996},
     zbl = {0853.52002},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1996__121_3_178711/}
}