The beauty of graphsPietarinen, Ahti-VeikkoDiagrammatic Representation and Inference : 10th International Conference, Diagrams 2018, Edinburgh, UK, June 18–22, 2018 : proceedings2018 / p. 9-12 https://doi.org/10.1007/978-3-319-91376-6_2 Conference Proceedings at Scopus Article at Scopus Conference Proceedings at WOS Article at WOS