Jean-Pierre Serre, Faisceaux algébriques cohérents, Ann. of Math. (2) 61, (1955). 197–278, MR0068874, doi
English translation by Piotr Achinger and Łukasz Krupa: pdf, source
is considered one of the most important algebraic geometry articles of 20th century; its sheaf-theoretic setup has certainly influenced a lot Grothendieck in his creation of the theory of schemes.