Testing results of a second stage concentrator designed for the solar furnace of plataforma solar de Almeria J. Farinha Mendes, M. Collares-Pereira, D. Martinez, J. Rodriguez et D. Alarcón Padilla J. Phys. IV France, 09 PR3 (1999) Pr3-569-Pr3-574 DOI: 10.1051/jp4:1999390