by Geffken, R.M., Komarek, K.L., Miller, E.M.
Published in Journal of solid state chemistry (1972)

by Hayer, E., Komarek, K.L., Gaune-Escard, M., Bros, J.P.
Published in Journal of non-crystalline solids (01.05.1993)

by Ettenberg, M., Komarek, K.L., Miller, E.
Published in Journal of solid state chemistry (1970)