Geodesic
The Signature Defect and the Homotopy of BPL and PL/O
Commentarii mathematici Helvetici, Tome 48 (1973), pp. 525-530.

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@article{CMH_1973__48_139565,
     author = {David Frank},
     title = {The {Signature} {Defect} and the {Homotopy} of {BPL} and {PL/O}},
     journal = {Commentarii mathematici Helvetici},
     pages = {525--530},
     publisher = {mathdoc},
     volume = {48},
     year = {1973},
     zbl = {0279.57012},
     url = {http://geodesic.mathdoc.fr/item/CMH_1973__48_139565/}
}
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David Frank. The Signature Defect and the Homotopy of BPL and PL/O. Commentarii mathematici Helvetici, Tome 48 (1973), pp. 525-530. http://geodesic.mathdoc.fr/item/CMH_1973__48_139565/