@book{170402,
	author = {International Gas Union, IGU and World Gas Conference (23rd. : 2006 jun 5-9 : Amsterdam, The Netherlands)},
	title = {Sustainable urban system design},
	note = {Disponible en HTML y PDF},
	url = {https://biblioteca.iapg.org.ar/ArchivosAdjuntos/IGU-Strategic-panels/Sustainable-urban-system-design-Netherlands1.ppt}
}