RT Article T1 Kelsen and Aquinas: A Conflict Over the Nature of Law and Legal Obligation JF The jurist VO 34 SP 94 OP 106 A1 Underwood Lewis, John LA English YR 1974 UL https://ixtheo.de/Record/1650235917 K1 Kelsen, Hans : 1881-1973 K1 Thomas : von Aquin, Heiliger : 1225-1274 K1 Rechtsbegriff