1. Department of Physics, Bellarmine University , 2001 Newburg Rd, Louisville, KY 40205, USA
2. Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University , Kotlářská 2, 611 37 Brno, Czech Republic
3. Center for Theoretical Physics, Polish Academy of Sciences , Al. Lotników 32/46, PL-02-668 Warsaw, Poland
4. Laboratório Nacional de Astrofísica - MCTIC , R. dos Estados Unidos, 154 - Nações, Itajubá - MG, 37504-364, Brazil
5. Instituto de Física y Astronomía, Facultad de Ciencias, Universidad de Valparaíso , Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile
6. Departamento de Astronomía, Universidad de Chile , Camino del Observatorio 1515, Casilla 36-D, Correo Central, Santiago, Chile
7. Department of Physics, Kansas State University , 116 Cardwell Hall, Manhattan, KS 66506, USA