Affiliation: | 1. LMGC, UMR-CNRS 5508, Université Montpellier-2, case courier 048, place Eugène-Bataillon, 34095 Montpellier cedex 5, France;2. Department of Mathematics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand;3. Centre of Excellence in Mathematics, CHE, Bangkok 10400, Thailand |