@techreport{iiasa13379,
           month = {December},
            type = {IIASA Working Paper},
           title = {Lagrangian functions and nondifferentiable optimization},
         address = {IIASA, Laxenburg, Austria},
       publisher = {WP-78-063},
            year = {1978},
             url = {https://pure.iiasa.ac.at/id/eprint/13379/},
          author = {Wierzbicki, A. P.}
}