Organically templated layered uranium(VI) phosphates: hydrothermal syntheses and structures of [NHEt3][(UO2)(2)(PO4)(HPO4)] and [NPr4][(UO2)(3)(PO4)(HPO4)(2)] - Francis, R; Drewitt, M; Halasyamani, P; Ranganathachar, C; O'Hare, D; Clegg, W; Teat, S (1998)