Cu La2 O4 Tuilier M, Chevalier B, Tressaud A, Brisson C, Soubeyroux J, Etourneau J Physica C 200 (1992) 113-121 EXAFS study at the LaLIII X-ray absorption edge of superconducting materials obtained by fluorination of La2-xSrxCuO4 oxides (0