Twins in Logic - Identical and Otherwise

Lloyd Humberstone. Twins in Logic - Identical and Otherwise. FLAP, 7(6):1071-1114, 2020. [doi]

@article{Humberstone20-0,
  title = {Twins in Logic - Identical and Otherwise},
  author = {Lloyd Humberstone},
  year = {2020},
  url = {http://collegepublications.co.uk/ifcolog/?00042},
  researchr = {https://researchr.org/publication/Humberstone20-0},
  cites = {0},
  citedby = {0},
  journal = {FLAP},
  volume = {7},
  number = {6},
  pages = {1071-1114},
}