1. Department of Mathematics, University of Paris VIII 93526, Saint-Denis, LAGA, UMR 7539, CNRS, Sorbonne Paris Cité, University of Paris XIII 93430 Villetaneuse, Telecom Paris, 91120 Palaiseau, France
2. Department of Mathematics and Computer Science, Necmettin Erbakan University 42090 Konya, Turkey