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By Jean-Pierre Serre. Annals of Mathematics, second series, 54(3), 425–505 (November 1951).

Institution-hosted original: www.college-de-france.fr/media/jean-pierre-serre/UPL7235285843586540944_Serre_The_se.pdf

Verified locator: printed page 425, Introduction; loop space, contractible total space and the relation between successive homotopy groups. Chapter II constructs the singular-homology spectral sequence.