Ewald, B., Prots, Y., & Kniep, R. (2004). Refinement of the crystal structures of praseodymium- and samarium-oxoborate-bis(oxophosphate)-oxide, Ln7O6[BO3][PO4]2, (Ln = Pr, Sm). Zeitschrift für Kristallographie-New Crystal Structures, 219(3), 233-235. doi:10.1524/ncrs.2004.219.14.233.