I didn't try and I will not try to find it. for ME, the SN method is good enough. I think it can be relatively peaceful, fast and reliable, if properly executed, as stated by the PPeH. of course each person has their own preferences for how fast and peaceful they want their method to be, but for me SN is more than good enough. feeling a strong taste in my mouth, headache, nausea, hypotension, fatique and then losing consciousness after 10 or 20 minutes sounds more than good for me. I think it's an excelent method. there are other reasons for me to think that as well, it's reliable, fast and effective when properly done. there is some relative safety from getting permanently damaged, disabled or creepled in case of failure. the discomfort during the proccess is minimal, although like I said, obviously each person has their own preferences for how much discomfort they are willing to feel and for how long.
PPeH's recommended way of doing the method seems very good. PPH also have a chapter to about N. perhaps everyone should read the latest edition of their book if they're interested.
switching from SN to N can also sometimes bring some issues related to low substance purity, scams and fake N. the so called "black market" obviously works differently from normal stores.
on the other hand, in Brazil, SN is found on normal stores, it's a cheap, common salt that's used for soamy things, including lab reactions, food processing etc, so there are no incentives to cut, alter of falsify it.
