%0 Journal Article %A V. V. Dontsov %T Systoles on Heisenberg groups with Carnot--Carath\'eodory metrics %J Sbornik. Mathematics %D 2001 %P 347-374 %V 192 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2001_192_3_a1/ %G en %F SM_2001_192_3_a1