Mathematical Inequalities & Applications · Volume 12, Issue 4 Heptagonal triangle as the extreme triangle of Dixmier-Kahane-Nicolas inequality 12-60 Pages 773-779 DOI 10.7153/mia-12-60 Downloads Short PDF Full PDF PNG Authors Vladimir Volenec Zdenka Kolar-Begović Ružica Kolar-Šuper Keywords heptagonal triangle indirect similarity Subject classes 51M04