1. Physics and Applied Mathematics Unit, Indian Statistical Institute, Kolkata 700108,
India
2. Department of Physics, Barathidasan University, Tiruchirapalli 620024,
India
3. Center for Interdisciplinary Research in Complex Systems, University of São Paulo, São
Paulo, São Paulo 03828-000, Brazil
4. Department of Mathematics, Jadavpur University, Kolkata 700032, India