Geodesic
How the Center of Gravity of a Triangle differs from that of a Quadrilateral
Matematičeskoe obrazovanie, no. 1 (2012), pp. 10-19 
S. V. Dvoryaninov; S. Krauter. How the Center of Gravity of a Triangle differs from that of a Quadrilateral. Matematičeskoe obrazovanie, no. 1 (2012), pp. 10-19. http://geodesic.mathdoc.fr/item/MO_2012_1_a2/
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     author = {S. V. Dvoryaninov and S. Krauter},
     title = {How the {Center} of {Gravity} of a {Triangle} differs from that of a {Quadrilateral}},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The positions of centers of gravity for triangles and quadrilaterals are defined, under the different mass distributions.