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Hulten K, Karttunen TJ, El-Zimaity HM, Naser SA, Collins MT, Graham DY, El-Zaatari FA (2000). "Identification of cell wall deficient forms of M. avium subsp. paratuberculosis in paraffin embedded tissues from animals with Johne's disease by in situ hybridization". J. Microbiol. Methods. 42 (2): 185–95. doi:10.1016/S0167-7012(00)00185-8. PMID11018275.
Gumpert J, Hoischen C (October 1998). "Use of cell wall-less bacteria (L-forms) for efficient expression and secretion of heterologous gene products". Current Opinion in Biotechnology. 9 (5): 506–9. doi:10.1016/S0958-1669(98)80037-2. PMID9821280.
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