Early discussion and results on Hurewicz cofibrations and NDR pairs:
Arne Strøm, Note on cofibrations, Math. Scand. 19 (1966) 11-14 (jstor:24490229, dml:165952, MR0211403)
Arne Strøm, Note on cofibrations II, Math. Scand. 22 (1968) 130–142 (jstor:24489730, dml:166037, MR0243525)
Introducing the Strøm model structure on topological spaces and discussion of the classical homotopy category:
Introducing the
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