@inproceedings{1046282,
    title = "Subsystems of Peano Arithmetic: some results and problems",
    author = "Δημητρακόπουλος, Κωνσταντίνος",
    year = "1997",
    pages = "1-5",
    publisher = "Πανεπιστήμιο Κύπρου",
    booktitle = "Α' Πανελλήνιο Συμπόσιο Λογικής: πρακτικά"
}