@article{701091,
     title = {Compact Hausdorff spaces with two or three types of open subspaces:new results and open questions},
     booktitle = {Abstracta. 5th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1977},
     pages = {65-68},
     url = {http://dml.mathdoc.fr/item/701091}
}

Mioduszewski, Jerzy. Compact Hausdorff spaces with two or three types of open subspaces:new results and open questions, dans Abstracta. 5th Winter School on Abstract Analysis, GDML_Books,  (1977), pp. 65-68. http://gdmltest.u-ga.fr/item/701091/