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References
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| 1. |
Steenrod N., Ann. Math., 48:2 (1947), 219–249   |
| 2. |
Mosher R., Tangora M., Kogomologicheskie operatsii i ikh prilozhenii v teorii gomotopii, Mir, M., 1970  |
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Madsen Y., Pacific J. Math., 60:1 (1975), 235–276 |
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Smirnov V. A., UMN, 42:2 (1987), 245–246  |
