1. M. Golinski ,Proc. Int. Solvent Extr. Conf. ISEC'71. Vol. 1 , Society of Chemical Industry , London , 1971 , p. 603 .
2. S. Facon , M. Avila-Rodriguez , G. Cote and D. Bauer ,Proc. Int. Solvent Extr. Conf. ISEC'93). Vol. 1 , Society of Chemical Industry , York , 1993 , p. 557 .