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A. L. Blakers and W. S. Massey, The homotopy groups of a triad I, Ann. of Math. vol. 53 (1951) pp. 161-205. MR 0038654 (12:435e)

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M. L. Curtis and M. K. Fort, Jr., Homotopy groups of one-dimensional spaces, Proc. Amer. Math. Soc. vol. 8 (1957) p. 578. MR 0086296 (19:158g)

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C. H. Dowker, Mapping theorems for noncompact spaces, Amer. J. Math. vol. 69 (1947) pp. 200-241. MR 0020771 (8:594g)

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J. Dugundji, An extension of Tietze's theorem, Pacific J. Math. vol. 1 (1951) pp. 353-367. MR 0044116 (13:373c)

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S. Eilenberg, Continuous mappings of infinite polyhedra, Ann. of Math. vol. 42 (1941) pp. 459-468. MR 0005350 (3:141h)

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D. W. Hall and G. L. Spencer, Elementary topology, Wiley, 1955, p. 81. MR 0074804 (17:649a)

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S. T. Hu, Mappings of a normal space into an absolute neighborhood retract, Trans. Amer. Math. Soc. vol. 64 (1948) pp. 336-358. MR 0026325 (10:138b)

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Y. Kodama, On metric spaces, Proc. Japan Acad. vol. 33 (1957) pp. 79-83. MR 0089411 (19:671b)

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B. H. McCandless, Test spaces for dimension , Proc. Amer. Math. Soc. vol. 7 (1956) pp. 1126-1130. MR 0083122 (18:662c)

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J. H. C. Whitehead, Combinatorial homotopy I, Bull. Amer. Math. Soc. vol. 55 (1949) pp. 213-245. MR 0030759 (11:48b)

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G. W. Whitehead, Homotopy theory, mimeographed notes compiled by Robert J. Aumann. MR 0091469 (19:974c)