References
- Schindler , V. and Geigy , J. R. A. G. DE 2011087 .
- Geigy , J. R. A. G. DE 943277 .
- Foucaud , A. and Bakouetila , M. 1987 . Synthesis , : 854
- Foucaud , A. and Rouillé , E. 1990 . Synthesis , : 787
- Haász , F. and Galamb , V. unpublished results