@article{700722,
     title = {On a method which leads to extremally disconnected covers},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1972},
     pages = {309-311},
     mrnumber = {MR0362197},
     zbl = {0327.54011},
     url = {http://dml.mathdoc.fr/item/700722}
}

Mioduszewski, J. On a method which leads to extremally disconnected covers, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1972), pp. 309-311. http://gdmltest.u-ga.fr/item/700722/