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References
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- ↑ Tomlinson, Ray. "The First Network Email". Archived from the original on 2006-05-06. Retrieved 2011-10-05.
- ↑ Cook, Stephen (1971). "The complexity of theorem proving procedures". Proceedings of the Third Annual ACM Symposium on Theory of Computing. pp. 151–158. doi:10.1145/800157.805047. ISBN 9781450374644. S2CID 7573663.
- ↑ Quillen, Daniel (1971). "The Adams Conjecture". Topology . 10: 67–80. doi: 10.1016/0040-9383(71)90018-8 . ISSN 0040-9383. MR 0279804.
- ↑ Takiff, S. J. (1971). "Rings of invariant polynomials for a class of Lie algebras". Transactions of the American Mathematical Society . 160: 249–262. doi: 10.2307/1995803 . ISSN 0002-9947. JSTOR 1995803. MR 0281839.
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- ↑ "Americas region is declared the world's first to eliminate rubella". WHO. 2015-04-30. Archived from the original on 2015-05-18. Retrieved 2015-04-30.
- ↑ Penrose, R.; Floyd, R. M. (1971). "Extraction of Rotational Energy from a Black Hole". Nature Physical Science. 229 (6): 177. Bibcode:1971NPhS..229..177P. doi:10.1038/physci229177a0.