https://www.autosport.com/indycar/news/indycar-updates-2013-dallara-dw12-to-improve-safety-and-durability-4463499/4463499/
IndyCar updates 2013 Dallara DW12 to improve safety and durability
IndyCar and Dallara have made updates to the DW12 chassis for the 2013 season with the aim of improving safety and durability
updates 2013dallara dw12improve safetyindycardurability