Jelitto, T., Sonnewald, U., Willmitzer, L., Hajirezeai, M., & Stitt, M. (1992). Inorganic Pyrophosphate Content and Metabolites in Potato and Tobacco Plants Expressing Escherichia-Coli Pyrophosphatase in Their Cytosol. Planta, 188(2), 238-244. doi:10.1007/BF00216819.