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| 73Val1 | Valitova, F. G., Ryzhmanov, Yu. M., Gazetdinova, N. G. (1973) Zh. Obshch. Khim. 43: 1491 |
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| 72Bal1 | Balaban, A.T. (1972) Rev. Roumaine Chim. 17: 9 |
| 71Bal1 | Balaban, A.T. (1971) Rev. Roumaine Chim. 16: 725 |
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