About the Authors

Jorge M. Pacheco

pacheco@cii.fc.ul.pt,

Affiliations Departamento de Matemática da Universidade do Minho, Campus de Gualtar, Braga, Portugal, ATP-group, CFTC, Complexo Interdisciplinar, Lisboa, Portugal, GADGET, Lisboa, Portugal

Flávio L. Pinheiro

Affiliations ATP-group, CFTC, Complexo Interdisciplinar, Lisboa, Portugal, GADGET, Lisboa, Portugal

Francisco C. Santos

Affiliations MLG and IRIDIA, Computer and Decision Engineering Department, Université Libre de Bruxelles, Brussels, Belgium, CENTRIA, Universidade Nova de Lisboa, Quinta da Torre, Caparica, Portugal, GADGET, Lisboa, Portugal

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JMP FCS. Performed the experiments: JMP FLP FCS. Analyzed the data: JMP FLP FCS. Wrote the paper: JMP FCS.