Sippel, M. (2004). Global Climate Policy and Correspondending Activies on a City-Level: A Case of Hamburg and Its Citypartnerships With a Special Focus on CDM-Potentials.

Sippel, Maike. Global Climate Policy and Correspondending Activies on a City-Level: A Case of Hamburg and Its Citypartnerships With a Special Focus on CDM-Potentials. Hamburg, 2004.

Sippel, Maike. Global Climate Policy and Correspondending Activies on a City-Level: A Case of Hamburg and Its Citypartnerships With a Special Focus on CDM-Potentials. 2004.