Safety of CNG Buses in Delhi: Findings and Recommendations
Authors: Lennart Erlandsson and Christopher Weaver
9 August 2002
http://www.cseindia.org/campaign/apc/pdf/SAFETYRE.PDF

Through the smokesrceen of lies: Myths and Facts about CNG, Centre for Science and Environment, New Delhi - August 2001
http://www.cseindia.org/campaign/apc/myths_facts/index_final.htm

Status of Implementation of CNG as a Fuel for Urban Buses in Delhi
Authors: Frank Dursbeck, Lennart Erlandsson and Christopher Weaver
23 May 2001
http://www.cseindia.org/campaign/apc/pdf/CNGEXPER.PDF

See also:
Presentations from the Leapfrog factor: Towards Clean Air in Asian Cities, March 2004:
http://www.cseindia.org/campaign/apc/leapfrog_factor.htm#march