Are N and S deposition altering the chemical composition of Norway spruce and Scots pine needles in Finland?

Reference:

Sebastiaan Luyssaert, Mika Sulkava, Hannu Raitio, and Jaakko Hollmén. Are N and S deposition altering the chemical composition of Norway spruce and Scots pine needles in Finland?. Environmental Pollution, 138(1):5–17, November 2005.

Suggested BibTeX entry:

@article{Luyssaert2005,
    author = {Sebastiaan Luyssaert and Mika Sulkava and Hannu Raitio and Jaakko Hollm{\'e}n},
    journal = {Environmental Pollution},
    month = {November},
    number = {1},
    pages = {5--17},
    title = {Are {N} and {S} deposition altering the chemical composition of {N}orway spruce and {S}cots pine needles in {F}inland?},
    volume = {138},
    year = {2005},
}