1. P.G. Daniele, A. De Robertis, C. De Stefano and S. Sammartano, J. Solution Chem., in press.
2. A. Casale, A. De Robertis, C. De Stefano and A. Gianguzza, Thermochim. Acta, in press.
3. A. Casale, P.G. Daniele, C. De Stefano and S. Sammartano, Talanta, submitted.