Regulated third party access (TPA) obliges the owner of an infrastructure, such as a natural gas pipeline to make it available for any user for a fee. If we want to model the European pipeline network with TPA, we must consider externalities. Kóczy’s paper titled “Modeling transfer profits as externalities in a cooperative game-theoretic model of natural gas networks” (joint with Dávid Csercsik, Franz Hubert and Balázs Sziklai) recently published in Energy Economics uses a simple partition function form game to model it. The paper is downloadable for free for 50 days.