- Diesel motor exhaust gas--Congresses (11)
- Diesel motor--Combustion--Congresses (5)
- Oxidizing agents--Congresses (3)
- Automobiles--Motors--Exhaust gas--Congresses (2)
- Automobiles--Pollution control devices--Congresses (2)
- Automobiles--Motors (Diesel)--Congresses (1)
- Motor vehicles--Pollution control devices--Congresses (1)