Citation: G\'andara, Felipe; Guti\'errez-Puebla, Enrique; Iglesias, Marta; Snejko, Natalia; Monge, M. \'Angeles (2010). Isolated Hexanuclear Hydroxo Lanthanide Secondary Building Units in a Rare-Earth Polymeric Framework Based onp-Sulfonatocalix[4]arene. Crystal Growth & Design, 10, pp. 128-.