Here is a link to an excellent paper by John Keown, which was recently published in the Cambridge Law Journal.
The paper is entitled “The Logical Link Between Voluntary and Non-Voluntary Euthanasia.”
Here is the abstract–
“The logical “slippery slope” argument is of key relevance to the ongoing debate about “assisted dying”. The argument runs that if the principle of respect for autonomy and the principle of beneficence justify voluntary euthanasia, then the principle of beneficence justifies non-voluntary euthanasia. Several prominent scholars of biomedical ethics and law have either rejected or at least not accepted the argument. This paper analyses their reasoning and finds it wanting. It concludes that the logical argument stands unrebutted and merits much greater attention.”