Reihe Contributions to EconomicsPiotr Pachura ×Physica × Regional CohesionEffectiveness of Network StructuresPiotr PachuraPhysicaSoftcover2012 Regional CohesionEffectiveness of Network StructuresPiotr PachuraPhysicaHardcover2009 Regional CohesionEffectiveness of Network StructuresPiotr PachuraPhysicaeBook2009