00712nam0-22002531i-450-99000128199040332120100308102315.0000128199FED01000128199(Aleph)000128199FED0100012819920001205d1969----km-y0itay50------baengPfaff's Problem and its Generalizationsby Schouten and KulkNew YorkChelsea1969Schouten,J.A.22783Kulk,Wouter van derITUNINARICAUNIMARCBK99000128199040332114-L-3311730MA1MA1Pfaff's problem and its generalizations277439UNINA