@article{701220,
     title = {Discontinuous invariant functio- nals and traces},
     booktitle = {Abstracta. 9th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1981},
     pages = {23-24},
     url = {http://dml.mathdoc.fr/item/701220}
}

Figiel, T.; Kwapień, S. Discontinuous invariant functio- nals and traces, dans Abstracta. 9th Winter School on Abstract Analysis, GDML_Books,  (1981), pp. 23-24. http://gdmltest.u-ga.fr/item/701220/