Derylo M, Skorupska A, Lorkiewicz Z
Arch Microbiol. 1978 Oct 4;119(1):87-90. doi: 10.1007/BF00407933.
Small cryptic plasmids of molecular weights ranging from 1 to 3 Mdal were detected by electron microscopy in Salmonella typhimurium strain LT2 (ColIb). They were divided into different size classes. Two of the cryptic plasmids were transferred simultaneously with ColIb to Escherichia coli.