1. N. B. Krotova, T. V. Kudryavtseva, and M. V. Rodnyanskaya, Instruments, Automation Facilities, and Control Systems. TS-4: Analytical Instruments and Instruments for Scientific Research, Issue 8, Foreign Liquid Analyzers [in Russian], Moscow (1986), p. 5.
2. D. Jagner, Anal. Chim. Acta,50, No. 1, 15 (1970).
3. A. Johansson and L. Pehrsson, Analyst,95, No. 1132, 652 (1970).
4. K. Waldmeier and W. Rellstab, Z. Anal. Chem.,264, No. 5, 337 (1973).
5. T. Anfält and D. Jagner, Anal. Chem. Acta,57, No. 1, 177 (1971).