Synergistic extraction of some divalent metal cations with 3-phenyl-4-benzoylisoxazol-5-one and P=O donor ligands in chloroform K. Torkestani, G.J. Goetz-Grandmont and J.-P. Brunette Analusis, 28 4 (2000) 324-329 DOI: 10.1051/analusis:2000122