@article{701125,
     title = {Problems concerning weak Asplund spaces},
     booktitle = {Abstracta. 6th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1978},
     pages = {71-73},
     url = {http://dml.mathdoc.fr/item/701125}
}

Phelps, R. R. Problems concerning weak Asplund spaces, dans Abstracta. 6th Winter School on Abstract Analysis, GDML_Books,  (1978), pp. 71-73. http://gdmltest.u-ga.fr/item/701125/