1. Pope Pius XII. Address to an international congress of anesthesiologists. L'Osservatore Romano. November 24, 1957
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3. Active and passive euthanasia;Rachels;N Engl J Med,1975
4. Death and dying: euthanasia and sustaining life: II. Ethical issues;Brock,1995
5. Bioethics in the language of the law;Schneider;Hastings Cent Rep,1994