@article{MO_2009_2_a4,
     author = {E. Potoskuev},
     title = {Reference {Problems} and {Theorems} for {Computing} of {Areas} of {Triangles} and {Quadrangles}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {31--40},
     year = {2009},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2009_2_a4/}
}