Transport properties and Mossbauer spectra of Fe-substituted La-10-(x)(Si,Al)(6)O-26 apatites - Shaula, AL; Kharton, VV; Waerenborgh, JC; Rojas, DP; Tsipis, E; Vyshatko, NP; Patrakeev, M; Marques, FMB; (Materials Research Bulletin, 2004)