Richard's Almanac by Richard Kaufman Volume 1, Number 7, March 1983 Page 62 et seq.
Personal Comment: It takes practice to get the double buckles and the triple buckles right, but it is well worth the hard work, as it really is a nice effect. And it is quite practical too. Just get them out of the deck and go on. The effect is ungimmicked which means no extra work adding and getting rid of any gimmick. I like it.