Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
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The 7 references without a DOI — listed, not checked
no DOI — not checkedHerbert D, Phipps PJ, Strange RE (1971) Chemical analysis of microbial cells. In: Norris JR, Ribbon DW (eds) Methods in microbiology, vol 5B. Academic Press, London New York, pp 209?304.
no DOI — not checkedSambrock J, Fritsch EF, Maniatis T (1989) Molecular cloning. A laboratory manual, 2nd ed. Appendix A3. Cold Spring Harbor Laboratory Press, Cold Spring Harbor NY.
no DOI — not checkedShaw DJ, Guest SN (1982) Amplification and product identification of the fnr gene of Escherichia coli. J Gen Microbiol 128: 2221?2228.
no DOI — not checkedSnell FD, Snell CT (1949) Colorimetric methods of analysis, 3rd ed. Van Nostrand, New York, pp 802?807.
no DOI — not checkedStouthamer AH (1988) Dissimilatory reduction of oxidized nitrogen compounds. In: Zehnder JB (ed) Biology of anaerobic microorganisms. Wiley, London New York, pp 246?303.
no DOI — not checkedUrbach W, Rupp W, Sturm H (1976) Experimente zur Stoffwechselphysiologie der Pflanzen. Thieme, Stuttgart, pp 218?222.
no DOI — not checkedZumft WG, Viebrock A, Körner H (1988) Biochemical and physiological aspects of denitrification. In: Cole JA, Ferguson SJ (eds) The nitrogen and sulphur cycles. Cambridge University Press, Cambridge, pp 245?279.
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