McKain, K., Down, A., Raciti, S., Budney, J., Hutyra, L.R., Floerchinger, C., Herdon, S., Zahniser, M., Nehrkorn, T., Jackson, R.B., Phillips, N., Wofsy, S.C., Methane Emissions from Natural Gas in the Urban Region of Boston, Massachusetts. Proceedings of the National Academy of Sciences of the United States of America 112: 1941-1946, 2015.