Dutta, Sujan (11 June 2009). "Crash focus on aging fleet". The Telegraph. Calcutta, India. Archived from the original on 5 April 2010. Retrieved 17 September 2009.
Dutta, Sujan (11 June 2009). "Crash focus on aging fleet". The Telegraph. Calcutta, India. Archived from the original on 5 April 2010. Retrieved 17 September 2009.