@article {tan2008sources,
	title = {Sources contributing to PM2. 5 in a commercial truck cabin in winter},
	journal = {Transportation Research Part D: Transport and Environment},
	volume = {13},
	number = {1},
	year = {2008},
	pages = {54{\textendash}58},
	publisher = {Pergamon},
	author = {Tan, Zhongchao and Tay, Richard}
}