RT Article T1 Letter: Active and passive euthanasia JF Journal of medical ethics VO 1 IS 3 SP 153 OP 153 A1 Flew, A. G. A1 Twycross, R. G. LA English PB BMJ Publ. YR 1975 UL https://www.ixtheo.de/Record/1816118192 DO 10.1136/jme.1.3.153