1. (a) Robson R, Abrahams BF, Batten SR, Gable RW, Hoskins BF, Liu J (1992) Supramolecular architecture. ACS publications, Washington, DC, Chapter 19, p 449.
2. (b) Dai J-C, Fu Z-Y, Wu X-T (2004) In: Nalwa HS (ed) Encyclopedia of nanoscience and nanotechnology, vol 10. American Scientific Publishers, p 247.
3. (c) Byrn MP, Curtis CJ, Hsiou Y, Khan SI, Sawin PA, Terzis A, Strouse CE (1996) In MacNicol DD, Toda F, Bishop R (eds) Comprehensive supramolecular chemistry, vol 6. Elsevier, Oxford, UK, p 715
4. (a) Yaghi OM, Li H, Davis C, Richardson D, Groy TL (1998) Accounts Chem Res 31:474.
5. (b) Eddaoudi M, Moler DB, Li H, Chen B, O’Keeffe M, Yaghi OM (2001) Accounts Chem Res 34:319