1. BATE-SMITH, E. C., SCIENTIFIC PROCEEDINGS OF THE ROYAL DUBLIN SOCIETY 27: 165 (1956).
2. BORNER, H, NATURWISSENSCHAFTEN 42: 583 (1955).
3. DUFRENOY, J, PHYTOPATHOLOGISCHE ZEITSCHRIFT 4: 37 (1931).
4. Feigl F. Spot Tests in Organic Chemistry 5: 135 (1956).
5. Feigl F. Spot Tests in Organic Chemistry 5: 382 (1956).