Citation: Harre, N.; Mercurio, D.; Trolliard, G.; Frit, B. (1998). Crystal structure of Ba~2~La~4~Ti~5~O~18~, member n = 6 of the homologous series (Ba,La)~n~Ti~n-1~O~3n~ of cation deficient perovskite-related compounds. European Journal of Solid State and Inorganic Chemistry, 35, pp. 77-90.