| | Bibliography | SAE 2005-01-0666 Design Optimization of Wall Flow Type Catalyzed |
| | Cordierite Particulate Filter for Heavy Duty Diesel; S. Yamaguchi et. al, |
| | NGK Insulators, Ltd.http://www.statista.com/statistics/189410/us- |
| | gasoline-and-diesel-consumption-for-highway-vehicles-since-1992/ |