Order:
  1.  36
    Syntactic characterisations of amalgamation, convexity and related properties.Paul D. Bacsich & Dafydd Rowlands Hughes - 1974 - Journal of Symbolic Logic 39 (3):433-451.
  2.  38
    Defining algebraic elements.Paul D. Bacsich - 1973 - Journal of Symbolic Logic 38 (1):93-101.