Independent Bases for Rules Admissible in Pretabular Logics. - Vladimir V. Rybakov; Vladimir R. Kiyatkin; Mehmet Terziler (Log. J. IGPL, 1999)

On Finite Model Property for Admissible Rules. - Vladimir R. Kiyatkin; Vladimir V. Rybakov; Tahsin Oner (Math. Log. Q., 1999)