About the Authors

Massimo Marchiori

massimo.marchiori@unipd.it

Affiliations Department of Mathematics, University of Padua, Padua, Italy, Atomium Culture, Brussels, Belgium

Lino Possamai

Affiliation Department of Mathematics, University of Padua, Padua, Italy

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MM LP. Performed the experiments: MM LP. Analyzed the data: MM LP. Contributed reagents/materials/analysis tools: MM LP. Wrote the paper: MM LP.