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I gave these two reference items some hyperlinks:
Emil Artin, John T. Tate, A note on finite ring extensions, J. Math. Soc Japan, Volume 3 (1951) 74–77 doi:10.2969/jmsj/00310074, pdf
Michael Atiyah, Ian G. Macdonald, Introduction to commutative algebra, (1969, 1994) pdf, ISBN:9780201407518
and I have copied these to the corresponding author-pages, see for instance here.
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