TY - JOUR AU - Steven Hurder TI - On the secondary classes of foliations with trivial normal bundles. JO - Commentarii mathematici Helvetici PY - 1981 SP - 307 EP - 326 VL - 56 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMH_1981__56_139872/ ID - CMH_1981__56_139872 ER -