@article{700776,
     title = {On the imbedding of extremally disconnected spaces into bicompacta},
     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 = {103-107},
     mrnumber = {MR0355966},
     zbl = {0314.54005},
     url = {http://dml.mathdoc.fr/item/700776}
}

Efimov, B. A. On the imbedding of extremally disconnected spaces into bicompacta, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1972), pp. 103-107. http://gdmltest.u-ga.fr/item/700776/