@article{MO_2012_1_a2,
     author = {S. V. Dvoryaninov and S. Krauter},
     title = {How the {Center} of {Gravity} of a {Triangle} differs from that of a {Quadrilateral}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {10--19},
     year = {2012},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2012_1_a2/}
}