Original sin in dialogue : A.-M. Dubarle, P. Grelot, P. Schoonenberg and Flick-Alszeghy as representatives of a much discussed question : dissertatio ad Doctoratum in Theologia Morali consequendum - Nwosah, Joseph Mary Chukwudi (Pontificia Universitas Lateranensis, Accademia Alfonsiana, 1990)