| | Duality Patterns in 2-PCD Fragments, p. 244, by Smessaert, Hans; Demey, Lorenz | 2017 | Classical Sigma-2 | 3 | Square |
| | Duality Patterns in 2-PCD Fragments, p. 244, by Smessaert, Hans; Demey, Lorenz | 2017 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 246, by Smessaert, Hans; Demey, Lorenz | 2017 | Degenerate Sigma-2 with Unconnectedness 4 | 4 | Rectangle |
| | Duality Patterns in 2-PCD Fragments, p. 246, by Smessaert, Hans; Demey, Lorenz | 2017 | A Single PCD | 2 | Square |
| | Duality Patterns in 2-PCD Fragments, p. 246, by Smessaert, Hans; Demey, Lorenz | 2017 | A Single PCD | 2 | Square |
| | Duality Patterns in 2-PCD Fragments, p. 246, by Smessaert, Hans; Demey, Lorenz | 2017 | Degenerate Sigma-2 with Unconnectedness 4 | 4 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 248, by Smessaert, Hans; Demey, Lorenz | 2017 | Degenerate Sigma-2 with Unconnectedness 4 | 4 | Rectangle |
| | Duality Patterns in 2-PCD Fragments, p. 248, by Smessaert, Hans; Demey, Lorenz | 2017 | A Single PCD | 2 | Square |
| | Duality Patterns in 2-PCD Fragments, p. 248, by Smessaert, Hans; Demey, Lorenz | 2017 | A Single PCD | 2 | Square |
| | Duality Patterns in 2-PCD Fragments, p. 248, by Smessaert, Hans; Demey, Lorenz | 2017 | Degenerate Sigma-2 with Unconnectedness 4 | 4 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 250, by Smessaert, Hans; Demey, Lorenz | 2017 | Classical Sigma-2 | 3 | Rectangle |
| | Duality Patterns in 2-PCD Fragments, p. 250, by Smessaert, Hans; Demey, Lorenz | 2017 | A Single PCD | 2 | Square |
| | Duality Patterns in 2-PCD Fragments, p. 250, by Smessaert, Hans; Demey, Lorenz | 2017 | A Single PCD | 2 | Square |
| | Duality Patterns in 2-PCD Fragments, p. 250, by Smessaert, Hans; Demey, Lorenz | 2017 | Classical Sigma-2 | 3 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-2 Graph | 3–4 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-4 Graph | 4–16 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-3 Graph | 3–8 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-3 Graph | 3–8 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-3 Graph | 3–8 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-2 Graph | 3–4 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-2 Graph | 3–4 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-3 Graph | 3–8 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-2 Graph | 3–4 | Octagon |
| | Duality Patterns in 2-PCD Fragments, p. 255, by Smessaert, Hans; Demey, Lorenz | 2017 | Sigma-2 Graph | 3–4 | Octagon |
| | Squaring the unknown: The generalization of logic according to G. Boole, A. De Morgan, and C. S. Peirce, p. 418, by Rodrigues, Cassiano Terra | 2017 | Classical Sigma-2 | 3 | Rectangle |