1. Laser Physics Centre, Research School of Physics, Australian National University, Canberra, Australia
2. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-980 Curitiba, Paraná, Brazil
3. Departamento de Fısica Atomica, Molecular y Nuclear, Universidad Complutense de Madrid, E-28040 Madrid, Spain
4. Instituto de Fısica Fundamental, Consejo Superior de Investigaciones Cientificas, Serrano 113-bis, 28006 Madrid, Spain
5. College of Science and Engineering, Flinders University, Adelaide, SA, Australia
6. Department of Actuarial Science and Applied Statistics, Faculty of Business and Management, UCSI University, Kuala Lumpur 56000, Malaysia
7. College of Science and Engineering, James Cook University, Townsville, Qld., Australia