de La Grandville, Olivier (1997). "Curvature and elasticity of substitution: Straightening it out". Journal of Economics. 66 (1): 23–34. doi:10.1007/BF01231465. S2CID154023144.
de La Grandville, Olivier (1997). "Curvature and elasticity of substitution: Straightening it out". Journal of Economics. 66 (1): 23–34. doi:10.1007/BF01231465. S2CID154023144.