Citation: Thomas, P. A.; Mayo, S. C.; Watts, B. E. (1992). Crystal structures of RbTiOAsO~4~, KTiO(P~0.58~,As~0.42~)O~4~, RbTiOPO~4~ and (Rb~0.465~,K~0.535~)TiOPO~4~, and analysis of pseudosymmetry in crystals of the KTiOPO~4~ family. Acta Crystallographica Section B, 48, pp. 401-407.