1. R. W. Barratt andJ. G. Horsfall, Connecticut Agr. Expt. Sta. Bull.508, 1, 1947.
2. M. W. Beijerinck, Arch. néerl. Sci.23, 367, 1889.
3. R. J. Block, Adv. Protein Chem.2, 119, 1945.
4. A. E. Dimond, J. G. Horsfall, J. W. Heuberger andE. M. Stoddard, Connecticut Agr. Expt. Sta. Bull.451, 635, 1941.
5. J. G. Horsfall, Fungicides and their action. Waltham, Mass. U.S.A., 1945.