Other References:
Jarvis ED, Widom RL, LaFauci G, Setoguchi Y, Richter IR, Rudner R. Chromosomal organization of rRNA operons in Bacillus subtilis. Genetics. 1988 Nov;120(3):625-635. DOI: 10.1093/genetics/120.3.625 PMID: 2465199, PMCID: PMC1203540