00318nam a2200121Ia 4500082001700000100002000017245010700037250000800144260002800152300000600180500000500186700000500191  a516bD213.LS  aDarboux, Gaston  aLecons sur la theorie generale des surfaces et les applications geometriques du calcul infinitesimalb  a3rd  aNew YorkbChelseac1972  a   a  a