@article{701141,
title = {On sets always of the first category},
booktitle = {Abstracta. 7th Winter School on Abstract Analysis},
series = {GDML\_Books},
publisher = {Czechoslovak Academy of Sciences},
address = {Praha},
year = {1979},
pages = {20-24},
url = {http://dml.mathdoc.fr/item/701141}
}
Grzegorek, E. On sets always of the first category, dans Abstracta. 7th Winter School on Abstract Analysis, GDML_Books, (1979), pp. 20-24. http://gdmltest.u-ga.fr/item/701141/