| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 15, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Degenerate Sigma-3 with Unconnectedness 4 | 4–5 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 2, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Classical Sigma-2 | 3 | Rectangle |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 2, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 2, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Jacoby-Sesmat-Blanché Sigma-3 | 4 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 4, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Classical Sigma-2 | 3 | Rectangle |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 4, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Degenerate Sigma-3 with Unconnectedness 4 | 5 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 4, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Degenerate Sigma-3 with Unconnectedness 4 | 5 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 7, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Degenerate Sigma-3 with Unconnectedness 4 | 4 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 7, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Degenerate Sigma-3 with Unconnectedness 4 | 4 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 11, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 11, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 12, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Degenerate Sigma-3 with Unconnectedness 4 | 4 | Hexagon |

| | Boolean Subtypes of the U4 Hexagon of Opposition, p. 12, by Demey, Lorenz; Erbas, Doruk Atahan | 2024 | Degenerate Sigma-3 with Unconnectedness 4 | 4 | Hexagon |

| | Critical Thinking. An Introduction to Reasoning Well, p. 97, by Watson, Jamie Carlin; Arp, Robert; King, Skyler | 2024 | Classical Sigma-2 | 3 | Rectangle |

| | Display Conventions for Octagons of Opposition, p. 2, by Makinson, David | 2024 | Buridan Sigma-4 | 6 | Octagon |

| | Display Conventions for Octagons of Opposition, p. 4, by Makinson, David | 2024 | Buridan Sigma-4 | 6 | Octagon |

| | Display Conventions for Octagons of Opposition, p. 5, by Makinson, David | 2024 | Buridan Sigma-4 | 6 | Hexagon |

| | Display Conventions for Octagons of Opposition, p. 6, by Makinson, David | 2024 | Buridan Sigma-4 | 6 | Hexagon |

| | Display Conventions for Octagons of Opposition, p. 8, by Makinson, David | 2024 | Keynes-Johnson Sigma-4 | 7 | Hexagon |

| | The Fuzziness of Financial Measurement. An Exploration of the Logic of Accounting's Indeterminacy, p. 34, by Irwin, Timothy C. | 2023 | Classical Sigma-2 | 3 | Square |

| | History of Health Terminology, p. 2, by Elkin, Peter L.; Smith, Barry | 2023 | Classical Sigma-2 | 3 | Rectangle |

| | Logic-Sensitivity and Bitstring Semantics in the Square of Opposition, p. 1706, by Demey, Lorenz; Frijters, Stef | 2023 | Classical Sigma-2 | 3 | Rectangle |

| | Logic-Sensitivity and Bitstring Semantics in the Square of Opposition, p. 1706, by Demey, Lorenz; Frijters, Stef | 2023 | Classical Sigma-2 | 3 | Rectangle |

| | Logic-Sensitivity and Bitstring Semantics in the Square of Opposition, p. 1706, by Demey, Lorenz; Frijters, Stef | 2023 | Degenerate Sigma-2 with Unconnectedness 4 | 4 | Rectangle |

| | Logic-Sensitivity and Bitstring Semantics in the Square of Opposition, p. 1708, by Demey, Lorenz; Frijters, Stef | 2023 | Classical Sigma-2 | 3 | Rectangle |