Card College 4 by Roberto Giobbi Page 1020 et seq. Page 1014 et seq. in the German Edition
Personal Comment: It's a really easy flourish if you have long fingers. If you don't (like me) it's tricky. But you can still get the cards to spread off the other cards if you help the packets a little bit, by flicking them against each other to make the release possible. Aside from that technical issue it really is a nice little way to display four cards. Or just two.