Citation: Do, J.; Bontchev, R.; Jacobson, A.J. (2000). A hydrothermal investigation of the 1/2V2 O5-H2 C2 O4/H3 P O4/N H4 O H system: synthesis and structures of (N H4) V O P O4 * 1.5(H2 O), (N H4) (N H4)0.5 V O P O4 * 1.5(H2 O), (N H4)2 [V O (H2 O)3]2 [V O (H2 O)] [V O (P O4)2] * 23(H2 O), (N H4)2 [V O (H P O4)]2 (C2 O4) (H2 O). Inorganic Chemistry, 39, pp. 3230-3237.