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Bioindicators of enhanced nitrogen deposition.
Pitcairn CE, Fowler D, Leith ID, Sheppard LJ, Sutton MA, Kennedy V, Okello E. Pitcairn CE, et al. Among authors: sheppard lj. Environ Pollut. 2003;126(3):353-61. doi: 10.1016/s0269-7491(03)00248-3. Environ Pollut. 2003. PMID: 12963296
Evidence for changing the critical level for ammonia.
Cape JN, van der Eerden LJ, Sheppard LJ, Leith ID, Sutton MA. Cape JN, et al. Among authors: sheppard lj. Environ Pollut. 2009 Mar;157(3):1033-7. doi: 10.1016/j.envpol.2008.09.049. Epub 2008 Nov 20. Environ Pollut. 2009. PMID: 19022543
δ15N of lichens reflects the isotopic signature of ammonia source.
Munzi S, Branquinho C, Cruz C, Máguas C, Leith ID, Sheppard LJ, Sutton MA. Munzi S, et al. Among authors: sheppard lj. Sci Total Environ. 2019 Feb 25;653:698-704. doi: 10.1016/j.scitotenv.2018.11.010. Epub 2018 Nov 3. Sci Total Environ. 2019. PMID: 30759595 Free article.
Diagnostic indicators of elevated nitrogen deposition.
Pitcairn C, Fowler D, Leith I, Sheppard L, Tang S, Sutton M, Famulari D. Pitcairn C, et al. Environ Pollut. 2006 Dec;144(3):941-50. doi: 10.1016/j.envpol.2006.01.049. Epub 2006 Apr 11. Environ Pollut. 2006. PMID: 16584821
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