Nakajima, H., Hagting, A., Kunji, E. R., Poolman, B., & Konings, W. N. (1997). Cloning and functional expression in Escherichia coli of the gene encoding the di- and tripeptide transport protein of Lactobacillus helveticus.

Nakajima, H., A. Hagting, E R. Kunji, B. Poolman, and W N. Konings. Cloning and Functional Expression in Escherichia Coli of the Gene Encoding the Di- and Tripeptide Transport Protein of Lactobacillus Helveticus. 1997.

Nakajima, H., et al. Cloning and Functional Expression in Escherichia Coli of the Gene Encoding the Di- and Tripeptide Transport Protein of Lactobacillus Helveticus. 1997.