Spark ignition natural gas engines—A review. Choa, H M & Heb, B. Energy Conversion and Management, 48(2):608–618, 2007.
bibtex   
@article{Choa2007,
author = {Choa, H M and Heb, B-Q.},
journal = {Energy Conversion and Management},
number = {2},
pages = {608--618},
title = {{Spark ignition natural gas engines—A review}},
volume = {48},
year = {2007}
}

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