A Weakening of Alpha graphs : quasi-Boolean algebrasPietarinen, Ahti-Veikko; Ma, MinghuiDiagrammatic Representation and Inference : 10th International Conference, Diagrams 2018, Edinburgh, UK, June 18–22, 2018 : proceedings2018 / p. 549-564 https://doi.org/10.1007/978-3-319-91376-6_50 Conference Proceedings at Scopus Conference Proceedings at WOS Article at WOS