1. 1967, References for Vol. III/7;Landolt-Börnstein - Group III Condensed Matter
2. c2055, VII.3.2 Phosphates with H2O;Key Elements: P, As, Sb, Bi
3. c1977, VII.3.1 Anhydrous phosphates;Key Elements: P, As, Sb, Bi
4. c1665, VII.3.1 Anhydrous phosphates;Key Elements: P, As, Sb, Bi