Sims, G. K.; Ellsworth, T. R.; Mulvaney, R. L. (1995). "Microscale determination of inorganic nitrogen in water and soil extracts". Communications in Soil Science and Plant Analysis. 26 (1–2): 303–316. doi:10.1080/00103629509369298.
Rhine, E. D.; Mulvaney, R. L.; Pratt, E. J.; Sims, G. K. (1998). "Improving the Berthelot Reaction for Determining Ammonium in Soil Extracts and Water". Soil Science Society of America Journal. 62 (2): 473. Bibcode:1998SSASJ..62..473R. doi:10.2136/sssaj1998.03615995006200020026x.
Sims, Gerald K. (2006). "Letter to the Editor on "Using the Berthelot Method for Nitrite and Nitrate Analysis"". Soil Science Society of America Journal. 70 (3): 1038. Bibcode:2006SSASJ..70.1038S. doi:10.2136/sssaj2005.0408l.
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Rhine, E. D.; Mulvaney, R. L.; Pratt, E. J.; Sims, G. K. (1998). "Improving the Berthelot Reaction for Determining Ammonium in Soil Extracts and Water". Soil Science Society of America Journal. 62 (2): 473. Bibcode:1998SSASJ..62..473R. doi:10.2136/sssaj1998.03615995006200020026x.
Sims, Gerald K. (2006). "Letter to the Editor on "Using the Berthelot Method for Nitrite and Nitrate Analysis"". Soil Science Society of America Journal. 70 (3): 1038. Bibcode:2006SSASJ..70.1038S. doi:10.2136/sssaj2005.0408l.
