Cone Ratio Analysis
Charnes et al. (1990) incorporate the upper and lower bounds on the ratio of shadow prices in a different way.They recognize that the restrictions define a convex cone in the positive quadrant in the multiplier of shadow price space.
A. Charnes, W.W. Cooper, and Z.M. Hunge D.B. Sun, 1990, "Polyhedral Cone-Ratio DEA models with an illustrative application to large commercial banks" Journal of Econometrics 46, 73-91.