A theoretical model of surface roughness in ultrasonic vibration assisted electrical discharge machining in gas. - Q. H. Zhang; J. H. Zhang; S. F. Ren; Z. W. Niu; X. Ai (Int. J. Manuf. Technol. Manag., 2005)

Discontinuous Finite-Element Phase-Field Modeling of Polycrystalline Grain Growth with Convection. - X. Ai; Y. Shu; B. Q. Li (Comput. Math. Appl., 2006)