https://ideas.repec.org/a/spr/joptap/v98y1998i2d10.1023_a1022637501082.html
Profit, Directional Distance Functions, and Nerlovian Efficiency
Downloadable (with restrictions)! The directional technology distance function is introduced, given an interpretation as a min-max, and compared with other...
profitdirectionaldistancefunctionsefficiency