@inproceedings{1046698,
    title = "Non-collapsing assumptions about complexity classes needed for proving non-approximability results",
    author = "Ζάχος, Ευστάθιος",
    year = "1997",
    pages = "125-136",
    publisher = "Πανεπιστήμιο Κύπρου",
    booktitle = "Α' Πανελλήνιο Συμπόσιο Λογικής: πρακτικά"
}