L 1 singular limit for relaxation and viscosity approximations of extended traffic flow models. Klingenberg, Christian; Lu, Yunguang; Zhao, Huijiang — 2003 Electronic Journal of Differential Equations (EJDE) [electronic only]
On the global stability of contact discontinuity for compressible Navier-Stokes equations Feimin Huang; Huijiang Zhao — 2003 Rendiconti del Seminario Matematico della Università di Padova