Geodesic
Explicit resolutions for the binary polyhedral groups and for other central extensions of the triangle gorups.
Commentarii mathematici Helvetici, Tome 58 (1983), pp. 433-452.

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Mots-clés : free resolutions, finitely presented groups, central extension, triangle group, exact sequence, periodic resolution, presentation, Jacobian map, Poincaré-duality groups, fundamental groups of Seifert fiber spaces 
@article{CMH_1983__58_139949,
     author = {Ralph Strebel},
     title = {Explicit resolutions for the binary polyhedral groups and for other central extensions of the triangle gorups.},
     journal = {Commentarii mathematici Helvetici},
     pages = {433--452},
     publisher = {mathdoc},
     volume = {58},
     year = {1983},
     zbl = {0541.20035},
     url = {http://geodesic.mathdoc.fr/item/CMH_1983__58_139949/}
}
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Ralph Strebel. Explicit resolutions for the binary polyhedral groups and for other central extensions of the triangle gorups.. Commentarii mathematici Helvetici, Tome 58 (1983), pp. 433-452. http://geodesic.mathdoc.fr/item/CMH_1983__58_139949/