| | Oppositions and Opposites, p. 161, by Schang, Fabien | 2012 | Sigma-5 Graph | 4 | Hexagon |
| | Oppositions and Opposites, p. 161, by Schang, Fabien | 2012 | Sigma-5 Graph | 4 | Hexagon |
| | Oppositions and Opposites, p. 161, by Schang, Fabien | 2012 | Sigma-5 Graph | 4 | Hexagon |
| | Oppositions and Opposites, p. 161, by Schang, Fabien | 2012 | Classical Sigma-7 | 4 | Tetraicosahedron |
| | Oppositions and Opposites, p. 161, by Schang, Fabien | 2012 | Classical Sigma-7 | 4 | Tetraicosahedron |
| | Oppositions and Opposites, p. 164, by Schang, Fabien | 2012 | Sigma-5 Graph | 4 | Hexagon |
| | Oppositions and Opposites, p. 164, by Schang, Fabien | 2012 | Sigma-5 Graph | 4 | Hexagon |
| | Oppositions and Opposites, p. 164, by Schang, Fabien | 2012 | Sigma-5 Graph | 4 | Hexagon |
| | Oppositions and Opposites, p. 165, by Schang, Fabien | 2012 | Classical Sigma-7 | 4 | Tetraicosahedron |
| | Oppositions and Opposites, p. 165, by Schang, Fabien | 2012 | Classical Sigma-7 | 4 | Tetraicosahedron |
| | Oppositions and Opposites, p. 166, by Schang, Fabien | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
| | Oppositions and Opposites, p. 166, by Schang, Fabien | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
| | Oppositions and Opposites, p. 166, by Schang, Fabien | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
| | Oppositions and Opposites, p. 168, by Schang, Fabien | 2012 | Classical Sigma-7 | 4 | Tetraicosahedron |
| | Oppositions and Opposites, p. 168, by Schang, Fabien | 2012 | Classical Sigma-7 | 4 | Tetraicosahedron |
| | Oppositions and Opposites, p. 168, by Schang, Fabien | 2012 | Classical Sigma-7 | 4 | Tetraicosahedron |
| | The Square of Opposition in Orthomodular Logic, p. 193, by Freytes, Hector; de Ronde, Christian; Domenech, Graciela | 2012 | Classical Sigma-2 | 3 | Rectangle |
| | Oppositions and Opposites, p. 167, by Schang, Fabien | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
| | Oppositions and Opposites, p. 167, by Schang, Fabien | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
| | Oppositions and Opposites, p. 167, by Schang, Fabien | 2012 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
| | No Group of Opposition for Constructive Logics: The Intuitionistic and Linear Cases, p. 202, by Mélès, Baptiste | 2012 | Classical Sigma-2 | 3 | Rectangle |
| | No Group of Opposition for Constructive Logics: The Intuitionistic and Linear Cases, p. 202, by Mélès, Baptiste | 2012 | Classical Sigma-2 | 3 | Rectangle |
| | No Group of Opposition for Constructive Logics: The Intuitionistic and Linear Cases, p. 202, by Mélès, Baptiste | 2012 | Classical Sigma-2 | 3 | Rectangle |
| | No Group of Opposition for Constructive Logics: The Intuitionistic and Linear Cases, p. 204, by Mélès, Baptiste | 2012 | Classical Sigma-2 | 3 | Rectangle |
| | No Group of Opposition for Constructive Logics: The Intuitionistic and Linear Cases, p. 205, by Mélès, Baptiste | 2012 | Classical Sigma-2 | 3 | Square |