Link to the IEEE Digital Library
Reservoir - When One Cloud Is Not Enough
Benny Rochwerger, David Breitgand, Amir Epstein, David Hadas, Irit Loy, Kenneth Nagin, Johan Tordsson, Carmelo Ragusa, Massimo Villari, Stuart Clayman, Eliezer Levy, Alessandro Maraschini, Philippe Massonet, Henar Muñoz, Giovanni Toffetti, "Reservoir - When One Cloud Is Not Enough" Computer, vol. 44, no. 3, pp. 44-51, Feb. 2011, doi:10.1109/MC.2011.64