Relational and Partial Variable Sets and Basic Predicate Logic

@article{Ghilardi1996RelationalAP,
  title={Relational and Partial Variable Sets and Basic Predicate Logic},
  author={Silvio Ghilardi and Giancarlo Meloni},
  journal={J. Symb. Log.},
  year={1996},
  volume={61},
  pages={843-872}
}