| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 130, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Moretti-Pellissier Sigma-4 | 4 | Cube |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 131, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Moretti-Pellissier Sigma-4 | 4–5 | Cube |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 133, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Keynes-Johnson Sigma-4 | 7 | Cube |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 134, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Keynes-Johnson Sigma-4 | 7 | Octagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 135, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Moretti-Pellissier Sigma-4 | 5 | Cube |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 136, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Keynes-Johnson Sigma-4 | 7 | Cube |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 137, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 139, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 140, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 140, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 141, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 142, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 143, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |

| | Structures of Opposition and Comparisons: Boolean and Gradual Cases, p. 144, by Dubois, Didier; Prade, Henri; Rico, Agnès | 2020 | Keynes-Johnson Sigma-4 | 7 | Cube |

| | Linguistic Meaning Meets Linguistic Form, p. 58, by Duffley, Patrick | 2020 | Classical Sigma-2 | 3 | Rectangle |

| | Objecting to uncertain conditional sentences. A cross-linguistic study, p. 138, by Politzer, Guy; Baratgin, Jean; Hattori, Ikuko; Hattori, Masasi | 2020 | Non-Sigma | 5 | Hexagon |

| | Games for Your Mind. The History and Future of Logic Puzzles, p. 40, by Rosenhouse, Jason | 2020 | Classical Sigma-2 | 3 | Rectangle |

| | The Mystery of the Fifth Logical Notion (Alice in the Wonderful Land of Logical Notions), p. 28, by Beziau, Jean-Yves | 2020 | A Single PCD | 2 | Square |

| | The Mystery of the Fifth Logical Notion (Alice in the Wonderful Land of Logical Notions), p. 28, by Beziau, Jean-Yves | 2020 | Classical Sigma-2 | 3 | Square |

| | The Mystery of the Fifth Logical Notion (Alice in the Wonderful Land of Logical Notions), p. 28, by Beziau, Jean-Yves | 2020 | A Single PCD | 2 | Square |

| | Louvain Theories of Topical Logic (c. 1450-1533). A Reassessment of the Traditionalist Thesis, p. 30, by Geudens, Christophe | 2020 | Sherwood-Czeżowski Sigma-3 | 4 | Hexagon |

| | Louvain Theories of Topical Logic (c. 1450-1533). A Reassessment of the Traditionalist Thesis, p. 72, by Geudens, Christophe | 2020 | Sherwood-Czeżowski Sigma-3 | 4 | Octagon |

| | Louvain Theories of Topical Logic (c. 1450-1533). A Reassessment of the Traditionalist Thesis, p. 99, by Geudens, Christophe | 2020 | Non-Sigma | 3 | Pentagon |

| | Graded Structures of Opposition in Fuzzy Natural Logic, p. 498, by Murinová, Petra | 2020 | Classical Sigma-2 | 3 | Rectangle |

| | Graded Structures of Opposition in Fuzzy Natural Logic, p. 499, by Murinová, Petra | 2020 | Degenerate Sigma-2 with Unconnectedness 4 | 4 | Rectangle |