Check for that first link on Pubmed. I was able to access the article that way.

I'm not finding this new article anywhere. The text in a Google book search where the study had been mentioned suggests that it's probably not the type of study I'm looking for though.

I doubt this type of study exists. About the best we could do is to compare the suicide rate in an area with no legal method for hospitalizing suicidal people against their will (if that exists and the country is developed enough to keep such statistics reasonably well) with the suicide rate of a comparable area.