John J. Rosko, Joseph W. Rachlin, The Effect of Cadium, Copper, Mercury, Zinc and Lead on Cell Division, Growth, and Chlorophyll a Content of the Chlorophyte Chlorella vulgaris, Bulletin of the Torrey Botanical Club, Vol. 104, No. 3 (Jul. - Sep., 1977), pp. 226-233
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Rosko et al. (1977) studied this question.