1. J. W. C. Johns, G. W. Chantry, and R. F. Barrow, Trans. Faraday Soc. 54, 1589 (1958).TFSOA40014-7672
2. D. R. Rao and P. Venkateswarlu, J. Mol. Spectry. 1, 287 (1961).JMOSA30022-2852
3. P. L. Timms, R. A. Kent, T. C. Ehlert, and J. L. Margrave, J. Am. Chem. Soc. 87, 2842 (1965); JACSAT0002-7863
4. P. L. Timms, R. A. Kent, T. C. Ehlert, and J. L. Margrave, Nature 207, 187 (1965).NATUAS0028-0836
5. V. M. Khanna, R. Hauge, G. Besenbruch, and J. L. Margrave, Proc. Intern. Symp. Mol. Struct. Spectry. Columbus, Ohio, 1966.