1.Changxing Miao, Gang Wu, Global well-posedness of the critical Burgers equation in critical Besov spaces, Journal of Differential Equations, 247 (2009), no.6, 1673-1693. 2.Gang Wu, Liutang Xue, Global well-posedness for the 2D inviscid Bénard system with fractional diffusivity and Yudovichʼs type data, Journal of Differential Equations, 2012, in press.