00371nam a2200121 a 450000500170000002000150001708200160003210000200004824500550006826000480012330000280017149000500019920251203110159.0  a0521589320  a514.74bGUE  aGuest, Martin A  aHarmonic maps, loop groups, and integrable systems  aCambridgebCambridge University Pressc1997  axiii, 194p.c23 cm P.B.  aLondon mathematical society student textsd38