1.		Energy associated with different travel choices / Susanne Becken, David G. Simmons, Chris Frampton Autor: Becken, Susanne Coautor: Simmons, David G. Frampton, Chris
2.		Segmenting tourists by their travel pattern for insights into achieving energy efficiency / Susanne Becken, David Simmons, Chris Frampton Autor: Becken, Susanne Coautor: Simmons, David Frampton, Chris