Article written by Emilio Alfaro in the Magazine "Información y Actualidad Astronómica" of the Instituto de Astrofísica de Andalucía (IAA-CSIC), number 5, pages 12 and 13, October 2001
Original source
Article written by Emilio Alfaro in the Magazine "Información y Actualidad Astronómica" of the Instituto de Astrofísica de Andalucía (IAA-CSIC), number 5, pages 12 and 13, October 2001