A Hardy inequality with remainder terms in the Heisenberg group and the weighted eigenvalue problem. Dou, Jingbo; Niu, Pengcheng; Yuan, Zixia — 2007 Journal of Inequalities and Applications [electronic only]
Ostrowski type inequalities related to the generalized Baouendi-Grushin vector fields Jingbo Dou; Yazhou Han — 2013 Rendiconti del Seminario Matematico della Università di Padova