French West Indies and Guiana University, TRIVIA, Department of Mathematics and Computer Science, Campus Fouillole, 97159 Pointe-à-Pitre Cedex, Guadeloupe.|French West Indies and Guiana University, TRIVIA, Department of Mathematics and Computer Science, Campus Fouillole, 97159 Pointe-à-Pitre Cedex, Guadeloupe.|French West Indies and Guiana University, TRIVIA, Department of Mathematics and Computer Science, Campus Fouillole, 97159 Pointe-à-Pitre Cedex, Guadeloupe.|French West Indies and Guiana University, TRIVIA, Department of Mathematics and Computer Science, Campus Fouillole, 97159 Pointe-à-Pitre Cedex, Guadeloupe.