Calam, C. T., Raistrick, H. and Todd, A. R., 1949.—“The potato eehvorm hatching factor. 1. The preparation of concentrates and a method of bioassay.” Biochem. J., 45, 513–519. (W.L. 2907).
Ellenby, C. and Gilbert, A. B., 1957.—“Cardiotonic activity of the potato-root eelworm hatching factor.” Nature, Load., 180, 1105–1106. (W.L. 14900).
Ellenby, C., 1958a.—“Root diffusates of Solatium tuberosum and Digitalis pupurea.”ibidem, 181, 920–921.
Ellenby, C., 1958b.—“Solutions of potato-root diffusates of low ion content.” Experientia, 14, 109. (W.L. 8095a).
Fenwick, D. W., 1952.—“The bioassay of potato-root diffusate.” Ann. appl. Biol., 39. 457–467. (W.L. 1025).
Katznelson, H., Rouatt, J. W. and Payne, T. B. M., 1955.—“The liberation of amino acids and reducing compounds by plant roots.” Plant and Soil, 7, 35–48.
Knudsen., A. and Dresbach, M., 1923. “A chemical method of assaying the active principles of Digitalis.” J. Pharmacol., 20, 205–220. (W.L. 11442).
Lyon, T. L., AND Wilson, J. K., 1921.—“Liberation of organic matter by roots of growing plants.” Mem. Cornell Agric. Exp. Sta., 40, 144. (W.L. 13370).
Marrian, D. H., Russell, P. P., Todd, A. R. and Waring, W. S., 1949.—“The potato eelworm hatching factor. 3. Concentration of the factor by chromatography. Observations on the nature of eclepic acid.” Biochem, J., 45, 524–528. (W.L. 2967).
“MARTINDALE”, 1943.—The extra Pharmacopoeia. London, The Pharmaceutical Press.
Rowson, J. M., 1952.—“Studies in the genus Digitalis. Part 1. The colorimetric estimation of digitoxin and of preparations of Digitalis purpurea.” J. Pharm.Lond., 4, 814–830. (W.L. 11442a).
Rowson, J. M., 1955.—“Studies in the genus Digitalis. Part 3. The extraction and evaluation of Digitalis purpurea leaf” J. Pharm.Lond., 7, 924–931.
Rowson, J. M. and Dyer, F. J., 1952.—“Studies in the genus Digitalis. Part 2. A comparison of the colorimetric and biological methods for the evaluation of Digitalis purpurea.” J. Pharm.Lond., 4, 831–843.