00289nam a2200109Ia 4500100001900000110002800019245004500047260002400092300000900116490004900125490000500174  aSamuel, Pierre  aUniversite de Paris-Sud  aMathematiques, Mathematiciens et Societe  aOrsay, Francec1986  av.p.  aPublications Mathematiques D'Orsay; 86-74.16  a