Citation: M. Kritikos et al., Hydrothermal synthesis, characterization and magnetic properties of three isostructural chain borophosphates; NH4M(III)[BP2O8(OH)] with M = V or Fe and NH4(Fe(III)(0.53)V(III)(0.47))[BP2O8(OH)], SOLID ST SC, 3(6), 2001, pp. 649-658