Ryo Tsunashima; De-Liang Long; Haralampos N. Miras; David Gabb; Chullikkattil P. Pradeep; Leroy Cronin. (2010). The Construction of High-Nuclearity Isopolyoxoniobates with Pentagonal Building Blocks: [HNb27O76]16− and [H10Nb31O93(CO3)]23−. , 49(1), 113–116.
doi:10.1002/anie.200903970