Li, Qing, Qiu, Sheng-Chao, Zhang, Yun-Qian, Xue, Sai-Feng, Tao, Zhu, Prior, Timothy J., Redshaw, Carl, Zhu, Qian-Jiang, Xiao, Xin, "Supramolecular assemblies constructed from inverted cucurbit[7]uril and lanthanide cations: synthesis, structure and sorption properties", RSC advances,