Marotta CA, Levy CC, Weissman SM, Varricchio F (July 1973). "Preferred sites of digestion of a ribonuclease from Enterobacter sp. in the sequence analysis of Bacillus stearothermophilus 5S ribonucleic acid". Biochemistry. 12 (15): 2901–4. doi:10.1021/bi00739a020. PMID4719125.
Marotta CA, Levy CC, Weissman SM, Varricchio F (July 1973). "Preferred sites of digestion of a ribonuclease from Enterobacter sp. in the sequence analysis of Bacillus stearothermophilus 5S ribonucleic acid". Biochemistry. 12 (15): 2901–4. doi:10.1021/bi00739a020. PMID4719125.