@article{Krasnopolsky_2012, title={Search for methane and upper limits to ethane and SO2 on Mars}, volume={217}, ISSN={0019-1035}, url={http://dx.doi.org/10.1016/j.icarus.2011.10.019}, DOI={10.1016/j.icarus.2011.10.019}, number={1}, journal={Icarus}, publisher={Elsevier BV}, author={Krasnopolsky, Vladimir A.}, year={2012}, month=jan, pages={144–152} }