1. A. Walsh, Spectrochim. Acta7, 108 (1955).
2. J. J. McAuliffe, Atomic Absorption Newsletter6, 69 (1967);G. F. Kirkbright, A. M. Smith undT. S. West, Analyst92, 411 (1967);L. Capacho-Delago undD. C. Manning, Analyst92, 553 (1967).
3. V. A. Fassel undV. G. Massotti, Analyt. Chemistry35, 252 (1963);
4. W. Slavin undD. C. Manning, Analyt. Chemistry35, 253 (1963);M. D. Amos undP. E. Thomas, Analyt. Chim. Acta32, 139 (1965).
5. J. S. Cartwright, C. Sebens undD. C. Manning, Atomic Absorption Newsletter5, 91 (1966).