Espelt, Mónica, et al. “Resolving the Magnetic Asymmetry of the Inner Space in Self-Assembled Dimeric Capsules Based on Tetraurea-calix[4]pyrrole Components”. CHIMIA, vol. 69, no. 11, Nov. 2015, p. 652, https://doi.org/10.2533/chimia.2015.652.