1. K. Kiukkola and C. Wagner:J. Electrochem. Soc., 1957, vol. 104, pp. 379–87.
2. B.C.H. Steele: inElectromotive Force Measurements in High Temperature Systems, C.B. Alcock, ed., I.M.M., London, 1968.
3. W. Pluschkell and H.J. Engell:Z. Metallk., ed., 1965, vol. 56, pp. 450–52.
4. W.A. Fischer and W. Ackermann:Arch. Eisenhuttenw., 1966, vol. 37, pp. 43–47.
5. J. Osterwald: Thesis, Technical University of Berlin, 1965.