Katharine Browne Stehle, Inhibiting Influence of Colloidal Starch, Inulin, and Agar on the Stimulation of Aspergillus niger by Zinc Sulphate, Bulletin of the Torrey Botanical Club, Vol. 59, No. 4 (Apr., 1932), pp. 191-217
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Katharine Browne Stehle (1932) studied this question.