Tiedeman, A. A., Keyhani, J., Kamholz, J., Daum, H. A., Gots, J. S., & Smith, J. M. (1989). Nucleotide sequence analysis of the purEK operon encoding 5'-phosphoribosyl-5-aminoimidazole carboxylase of Escherichia coli K-12.

Tiedeman, A A., J. Keyhani, J. Kamholz, H A. Daum, J S. Gots, ja J M. Smith. Nucleotide Sequence Analysis of the PurEK Operon Encoding 5'-phosphoribosyl-5-aminoimidazole Carboxylase of Escherichia Coli K-12. 1989.

Tiedeman, A A., et al. Nucleotide Sequence Analysis of the PurEK Operon Encoding 5'-phosphoribosyl-5-aminoimidazole Carboxylase of Escherichia Coli K-12. 1989.