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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
added a couple of original references:
Norman Steenrod, Section 6.7 of: The topology of fibre bundles, Princeton Mathematical Series 14, Princeton Univ. Press (1951) [jstor:j.ctt1bpm9t5]
Morris Hirsch, Chapter 2.2 (Thm. 2.5) in: Differential topology, Springer Graduate Texts in Mathematics 33 (1976) [doi:10.1007/978-1-4684-9449-5, gBooks]
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