P Onorato and P Mascheretti and A DeAmbrosis (2012). "Investigating the magnetic interaction with Geomag and Tracker Video Analysis: static equilibrium and anharmonic dynamics". European Journal of Physics. 33 (2). IOP Publishing: 385–395. Bibcode:2012EJPh...33..385O. doi:10.1088/0143-0807/33/2/385.
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P Onorato and P Mascheretti and A DeAmbrosis (2012). "Investigating the magnetic interaction with Geomag and Tracker Video Analysis: static equilibrium and anharmonic dynamics". European Journal of Physics. 33 (2). IOP Publishing: 385–395. Bibcode:2012EJPh...33..385O. doi:10.1088/0143-0807/33/2/385.