@article {1655,
	title = {Some chemical reactions of sulphur dioxide after absorption by alfalfa and sugar beets.},
	volume = {19},
	year = {1944},
	pages = {212-226},
	author = {Thomas, M.D. and Hendricks, R.H. and Hill, G.R.}
}
@article {1652,
	title = {The utilization of sulphate and sulphur dioxide for the sulphur nutrition of alfalfa.},
	volume = {18},
	year = {1943},
	pages = {345-371},
	author = {Thomas, M.D. and Hendricks, R.H. and Collier, T.R. and Hill, G.R.}
}
@article {1656,
	title = {Influence of leaf destruction by sulphur dioxide and by clipping on yield of alfalfa.},
	volume = {8},
	year = {1933},
	pages = {223-245},
	author = {Hill Jr, G.R. and Thomas, M.D.}
}
