@article{MO_2014_72_4_a1,
     author = {S. V. Shvedenko},
     title = {On the {Goursat} formula in polar coordinates},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {6--8},
     publisher = {mathdoc},
     volume = {72},
     number = {4},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2014_72_4_a1/}
}