Schön, E.-M., Marqués-Lõpez, E., Herrera, R. P., Alemán, C., & Díaz, D. D. (2014). Exploiting molecular self-assembly: From urea-based organocatalysts to multifunctional supramolecular gels. Chemistry - A European Journal, 20(34), 10720-10731. https://doi.org/10.1002/CHEM.201402436