" Lindelöf in" versus "in Lindelöf" / A. Dow and J. VermeerNot all ơ-complete Boolean algebras are quotients of complete Boolean algebras / A. Dow and J. VermeerA model for no borel liftings / A. Dow and J. VermeerExtremally disconnected spaces, subspaces and retractions / A. Dow and J. VermeerVariations on a theorem of Lusternik and Schnirelmann / Jan M. Aarts, Robbert J. Fokkink, Hans VermeerOn colorings of maps / M.A. van Hartskamp, J. VermeerCoincidence theorems for involutions / Jan M. Aarts, Robbert J. Fokkink and Hans VermeerNon-equality of inductive completeness degrees / Klaas Pieter Hart, Jan van Mill, Hans Vermeer