@article {241,
	title = {Accumulation of amino acids in some boreal forest plants in response to increased nitrogen availability},
	journal = {New Phytologist},
	volume = {126},
	year = {1994},
	pages = {137-143},
	author = {N{\"a}sholm, T. and Edfast, A-B. and Ericsson, A. and Nord{\'e}n, L-G.}
}
@article {240,
	title = {Seasonal changes in amino acids, protein and total nitrogen in needles of fertilised Scots pine trees},
	journal = {Tree Physiology},
	volume = {6},
	year = {1990},
	pages = {267-281},
	author = {N{\"a}sholm, T. and Ericsson, A.}
}
