no. 1
On Grothendieck universes
Compositio Mathematica, Tome 21 (1969) no. 1, pp. 1-3. 
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Williams, N. H. On Grothendieck universes. Compositio Mathematica, Tome 21 (1969) no. 1, pp. 1-3. http://www.numdam.org/item/CM_1969__21_1_1_0/

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