The chains on the loops and 4-dimensional homotopy types
Homotopie algébrique et algèbre locale, Astérisque, no. 113-114 (1984), pp. 44-59. 
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     author = {Baues, Hans Joachim},
     title = {The chains on the loops and $4$-dimensional homotopy types},
     booktitle = {Homotopie alg\'ebrique et alg\`ebre locale},
     series = {Ast\'erisque},
     pages = {44--59},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {113-114},
     year = {1984},
     mrnumber = {749042},
     zbl = {0555.55007},
     language = {en},
     url = {http://www.numdam.org/item/AST_1984__113-114__44_0/}
}
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Baues, Hans Joachim. The chains on the loops and $4$-dimensional homotopy types, dans Homotopie algébrique et algèbre locale, Astérisque, no. 113-114 (1984), pp. 44-59. http://www.numdam.org/item/AST_1984__113-114__44_0/

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