1. University of British Columbia & LRI, Univ. Paris-Sud, CNRS, Inria, Université Paris-Saclay., Vancouver, BC, Canada
2. Lancaster University & LRI, Univ. Paris-Sud, CNRS, Inria, Université Paris-Saclay., Lancaster, United Kingdom
3. University of British Columbia, Vancouver, BC, Canada
4. Univ. Paris-Sud, CNRS, Inria, Université Paris-Saclay, Orsay, France