@article{MO_2014_71_3_a1, author = {V. Drozdov}, title = {What did our grandfathers solved in the old time}, journal = {Matemati\v{c}eskoe obrazovanie}, pages = {19--33}, publisher = {mathdoc}, volume = {71}, number = {3}, year = {2014}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MO_2014_71_3_a1/} }