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Guerra, André G C; Carvalho, Paulo Simeão (1 August 2016). "Orbital motions of astronomical bodies and their centre of mass from different reference frames: a conceptual step between the geocentric and heliocentric models". Physics Education. 51 (5). arXiv:1605.01339. Bibcode:2016PhyEd..51e5012G. doi:10.1088/0031-9120/51/5/055012.
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Guerra, André G C; Carvalho, Paulo Simeão (1 August 2016). "Orbital motions of astronomical bodies and their centre of mass from different reference frames: a conceptual step between the geocentric and heliocentric models". Physics Education. 51 (5). arXiv:1605.01339. Bibcode:2016PhyEd..51e5012G. doi:10.1088/0031-9120/51/5/055012.
Guerra, André G C; Carvalho, Paulo Simeão (1 August 2016). "Orbital motions of astronomical bodies and their centre of mass from different reference frames: a conceptual step between the geocentric and heliocentric models". Physics Education. 51 (5). arXiv:1605.01339. Bibcode:2016PhyEd..51e5012G. doi:10.1088/0031-9120/51/5/055012.