00306nam a2200121Ia 4500082001700000100002800017245005600045260002500101300001000126490003800136500000500174700000500179  a516bC538.DT  aChillingworth, D. R. J.  aDifferential topology with a view to applicationsb  aLondonbPitmanc1976  a291p.  aResearch notes in Mathematicsv 9  a  a