Geodesic
Relative equilibria in the motion of a triangle and a point under mutual attraction
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2014), pp. 45-51

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The planar motion of a massive triangle and a point under the action of mutual Newtonian attraction is considered. The steady-state configurations are found and the sufficient conditions of their stability are studied. The applicability of barycentric coordinates are discussed for such problems. 
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     author = {V. I. Nikonov},
     title = {Relative equilibria in the motion of a triangle and a point under mutual attraction},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {45--51},
     publisher = {mathdoc},
     number = {2},
     year = {2014},
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     url = {http://geodesic.mathdoc.fr/item/VMUMM_2014_2_a6/}
}
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V. I. Nikonov. Relative equilibria in the motion of a triangle and a point under mutual attraction. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2014), pp. 45-51. http://geodesic.mathdoc.fr/item/VMUMM_2014_2_a6/