Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1970_8_6_a16, author = {Yu. G. Dutkevich}, title = {Diameter of the set of midpoints of chords of a~bounded closed set}, journal = {Matemati\v{c}eskie zametki}, pages = {831}, publisher = {mathdoc}, volume = {8}, number = {6}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_6_a16/} }
Yu. G. Dutkevich. Diameter of the set of midpoints of chords of a~bounded closed set. Matematičeskie zametki, Tome 8 (1970) no. 6. http://geodesic.mathdoc.fr/item/MZM_1970_8_6_a16/