Somer, M., Carrillo-Cabrera, W., Peters, K., & von Schnering, H. G. (1998). Crystal structure of tetrasodium octaeuropium(II) pentaphosphido(3-)-diphosphido(4-)-digallate(III) catena-triphosphido(3-)-diphosphido(4-)-digallate(III), Na4Eu8[Ga2P5(P2)][Ga2P3(P2)]. Zeitschrift für Kristallographie - New Crystal Structures, 213, 687-698.