Diesel Dual Fuel

Hello everybody! I'm doing a research about Diesel Dual Fuel vehicles for the final test at school. I already know something but I'm still looking for every kind of information about it (also about marine dual fuels, though they aren't in my research they can be useful), expecially about his invention, his story and his evolution to locate it in an historical period. Can you guys help me?
Thanks a lot:grinno: