@article{701087,
     title = {Extension of functions on Boolean algebras},
     booktitle = {Abstracta. 5th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1977},
     pages = {39-42},
     url = {http://dml.mathdoc.fr/item/701087}
}

Lipecki, Z. Extension of functions on Boolean algebras, dans Abstracta. 5th Winter School on Abstract Analysis, GDML_Books,  (1977), pp. 39-42. http://gdmltest.u-ga.fr/item/701087/