@unpublished{TopchishviliMaisuradzeEhrgott1999,
  author  = {Alexander L. Topchishvili and Vilhelm G. Maisuradze and Matthias Ehrgott},
  title   = {Convex Operators in Vector Optimization: Directional Derivatives and the Cone of Decrease Directions},
  institution = {Fachbereich Mathematik},
  series    = {Report in Wirtschaftsmathematik (WIMA Report)},
  number    = {40},
  year    = {1999},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-4830},
}