NPR : My Final Landing: - Suicide by airplane. - http://www.npr.org/templates/story/story.php?storyId=4474032
Death with Dignity FAQ: Section 8 - Includes a subsection on the use of inert gas to hasten death. - http://www.togopeacefully.com/DYING.html
Suicide and Attempted Suicide: Methods and Consequences - Medical consequences of suicide attempts. Contains substantial parts of Geo Stone's standard reference book, plus additional material. - http://suicidemethods.net