Order:
  1.  52
    Syntactic characterisations of amalgamation, convexity and related properties.Paul D. Bacsich & Dafydd Rowlands Hughes - 1974 - Journal of Symbolic Logic 39 (3):433-451.
  2.  49
    Defining algebraic elements.Paul D. Bacsich - 1973 - Journal of Symbolic Logic 38 (1):93-101.