@article{701066,
     title = {On barycentrs in non-compact sets},
     booktitle = {Abstracta. 4th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1976},
     pages = {151-153},
     url = {http://dml.mathdoc.fr/item/701066}
}

von Weizsäcker, Heinrich. On barycentrs in non-compact sets, dans Abstracta. 4th Winter School on Abstract Analysis, GDML_Books,  (1976), pp. 151-153. http://gdmltest.u-ga.fr/item/701066/