@article{GrimmKleinertLiersetal.2017, author = {Veronika Grimm and Thomas Kleinert and Frauke Liers and Martin Schmidt and Gregor Z{\"o}ttl}, title = {Optimal Price Zones of Electricity Markets: A Mixed-Integer Multilevel Model and Global Solution Approaches}, journal = {Optimization Methods and Software}, number = {34(2)}, pages = {406 -- 436}, year = {2017}, }