Radescu, E., Jr.; Vaman, G. (2012), “Cartesian multipole expansions and tensorial identities”, Progress in Electromagnetics Research B36: 89–111, doi:10.2528/PIERB11090702
Scagnoli, V.; Staub, U.; Bodenthin, Y.; de Souza, R. A.; Garcia-Fernandez, M.; Garganourakis, M.; Boothroyd, A. T.; Prabhakaran, D. et al. (2011), “Observation of orbital currents in CuO”, Science332 (6030): 696–698, Bibcode: 2011Sci...332..696S, doi:10.1126/science.1201061, PMID21474711.
Lehmann, Jannis; Donnelly, Claire; Derlet, Peter M.; Heyderman, Laura J.; Fiebig, Manfred (2019), “Poling of an artificial magneto-toroidal crystal”, Nature Nanotechnology14 (2): 141–144, doi:10.1038/s41565-018-0321-x, PMID30531991.
Scagnoli, V.; Staub, U.; Bodenthin, Y.; de Souza, R. A.; Garcia-Fernandez, M.; Garganourakis, M.; Boothroyd, A. T.; Prabhakaran, D. et al. (2011), “Observation of orbital currents in CuO”, Science332 (6030): 696–698, Bibcode: 2011Sci...332..696S, doi:10.1126/science.1201061, PMID21474711.
Scagnoli, V.; Staub, U.; Bodenthin, Y.; de Souza, R. A.; Garcia-Fernandez, M.; Garganourakis, M.; Boothroyd, A. T.; Prabhakaran, D. et al. (2011), “Observation of orbital currents in CuO”, Science332 (6030): 696–698, Bibcode: 2011Sci...332..696S, doi:10.1126/science.1201061, PMID21474711.
Lehmann, Jannis; Donnelly, Claire; Derlet, Peter M.; Heyderman, Laura J.; Fiebig, Manfred (2019), “Poling of an artificial magneto-toroidal crystal”, Nature Nanotechnology14 (2): 141–144, doi:10.1038/s41565-018-0321-x, PMID30531991.