On homotopy limits, completions and localizations (such as p-completion and rationalization):
Aldridge Bousfield, Daniel Kan, Localization and completion in homotopy theory, Bull. Amer. Math. Soc. 77 6 (1971) 1006-1010 [doi:10.1090/S0002-9904-1971-12837-9, pdf]
Aldridge K. Bousfield, Daniel M. Kan: Homotopy Limits, Completions and Localizations, Lecture Notes in Mathematics 304 Springer, (1972; 1987) [doi:10.1007/978-3-540-38117-4]
and introducing what came to be known as Bousfield localization (of spectra via that of model categories):
On orthogonal factorization systems:
On the core of a ring:
On rational homotopy theory and the fundamental theorem of dg-algebraic rational homotopy theory:
Establishing the Bousfield-Friedlander model structure, in particular the stable model structure on topological sequential spectra:
On the universal Kan fibration (origin of the univalence axiom):
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