Publications Mathématiques de l’IHÉS 5, pages 5–64. DOI: doi.org/10.1007/BF02684746
Final section, pages 63–64, especially Satz 5: local freeness and bijective fiber-cohomology comparison under constant fiber dimension; Satz 6 records Euler-characteristic constancy under flatness and a reduced connected base. Indexed original passages were read; direct PDF fetching timed out. Archive metadata identifies a later correction, which should be retained alongside the original bibliographic record.