1. Engineering Department, Pontifical Catholic University of Peru, Av. Universitaria 1801, Lima 32, Peru
2. Sciences Department, Pontifical Catholic University of Peru, Av. Universitaria 1801, Lima 32, Peru
3. 4MAT, Université Libre de Bruxelles, CP 194/03, 50 Avenue Roosevelt, B-1050 Brussels, Belgium
4. LISM, EA 4695, UFR Sciences Exactes et Naturelles, Université de Reims Champagne-Ardenne, BP 1039, 51687 Reims cedex 2, France