[1] Indian Inst Technol Madras, Dept Math, Ctr Computat Math & Data Sci, Chennai 600036, Tamil Nadu, India
[2] Max Planck Inst Complex Dynam Syst, Proc Synth & Proc Dynam, D-39106 Magdeburg, Germany
[3] Friedrich Alexander Univ Erlangen Nuremberg, Inst Particle Technol, D-91058 Erlangen, Germany
[4] Indian Inst Technol Kharagpur, Dept Math, Kharagpur 721302, W Bengal, India