Biomass fuel use and indoor air pollution in homes in Malawi
D G Fullerton, S Semple, F Kalambo, A Suseno, R Malamba, G Henderson, J G Ayres, and S B Gordon
Occup Environ Med. 2009 November; 66(11): 777–783. Published online 2009 August 10. doi: 10.1136/oem.2008.045013.PMCID: PMC2760244