@article{MO_2020_94_2_a4,
     author = {Al. A. Privalov},
     title = {On some properties and criterions of a parallelogram, finished},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {94},
     number = {2},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2020_94_2_a4/}
}