Article written by Emilio Alfaro in the Magazine "Información y Actualidad Astronómica" of the Instituto de Astrofísica de Andalucía (IAA-CSIC), number 32, October 2010.
Original source
Article written by Emilio Alfaro in the Magazine "Información y Actualidad Astronómica" of the Instituto de Astrofísica de Andalucía (IAA-CSIC), number 32, October 2010.