Reverses of the continuous triangle inequality for Bochner integral of vector-valued functions in Hilbert spaces. Dragomir, S.S. (2005) JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Reverses of the triangle inequality in Banach spaces. Dragomir, Sever S. (2005) JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]
Riesz potential on the Heisenberg group. Xiao, Jinsen, He, Jianxun (2011) Journal of Inequalities and Applications [electronic only]