Other References:
Steinmetz M, Kunst F, Dedonder R. Mapping of mutations affecting synthesis of exocellular enzymes in Bacillus subtilis: Identity of the sacUh, amyB and pap mutations. Molecular & General Genetics. 1976 Nov 17;148(3):281–285. DOI: 10.1007/BF00332902 PMID: 827683