Published: 1948 Received: -Available on J-STAGE: May 22, 2009Accepted: -
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Date of correction: May 22, 2009Reason for correction: -Correction: CITATIONDetails: Wrong : 1) J. A. Hedall; Z. anorg. allg. chem. 120 (1922) 327 2) J. A. Hedvall. u. S. O. Sanberg; Z. anorg. all ?? chem. 240 (1938) 15. 3) Cook; Am. Jour. Sci. (3)48 150(1894) L. S. Birks and H. Friedman; J. Appl, phy. 17 (1946) 657.
Right : 1) J. A. Hedall; Z. anorg. allg. chem. 120 (1922) 327 2) J. A. Hedvall. u. S. O. Sanberg; Z. anorg. allg chem. 240 (1938) 15. 3) Cook; Am. Jour. Sci. (3)48 150(1894) L. S. Birks and H. Friedman; J. Appl, phy. 17 (1946) 657.
