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APA Citation
Keppler, F., Schiller, A., Ehehalt, R., Greule, M., Hartmann, J., & Polag, D. (n.d.). stable isotope and high precision concentration measurements confirm that all humans produce and exhale methane. Journal of breath research, 10, . http://access.bl.uk/ark:/81055/vdc_100087648543.0x000021