1. W. W. Wendlandt and L. W. Collins, Anal. Chim. Acta, 71 (1974) 411.
2. G. Margomenou-Leonipoulou, K. Theodoratos and G. G. Macris, Arch. Pharm. (Athens), 30 (1974) 100.
3. A. Chauvet and J. Masse, Trav. Soc. Pharm. Montpellier, 38 (1978) 31.
4. E. Domagalina and T. Slawik, Acta Pol. Pharm., 33 (1976) 623.
5. C. Martinez Recari, J. M. Sanches Monge, J. A. Perez de Ciriza and F. Marcótegni, Rev. Asoc. Esp. Farm. Hosp., 6 (1982) 57.