"Managing careers in organization" (with Jin Li and Michael Powell), Journal of Labor Economics, 36 (1): 197-252.
"A general solution method for moral hazard problems" (with Chris Ryan), Theoretical Economics. 13 (3):1425-1481.
"Monotonicity of optimal contracts without the first-order approach" (with Chris Ryan), Operation Research, 66 (4): 1101-1118.