[1] Univ Chile, DCC, Beauchef 851, Santiago, Chile
[2] IMFD, Santiago, Chile
[3] Linkoping Univ, S-58183 Linkoping, Sweden
[4] Vrije Univ Amsterdam, De Boelelaan 1111, NL-1081 HV Amsterdam, Netherlands
[5] Elsevier, Discovery Lab, Amsterdam, Netherlands
[6] Univ Bari, Dipartimento Informat, Campus Univ,Via Orabona 4, I-70126 Bari, Italy
[7] Rutgers State Univ, New Brunswick, NJ USA
[8] WU Vienna, Vienna, Austria
[9] Univ Oviedo, Dept Comp Sci, Oviedo 33007, Spain
[10] Sapienza Univ Rome, Rome, Italy
[11] Paderborn Univ, DICE, Warburgerstr 100, D-33098 Paderborn, Germany
[12] Rensselaer Polytech Inst, Tetherless World Constellat, 164 James St, Worcester, MA 01603 USA
[13] Univ Milano Bicocca, Milan, Italy
[14] Univ Bonn, Bonn, Germany
[15] Univ Stuttgart, IPVS, Univ Str 32, D-70569 Stuttgart, Germany
[16] Dataworld, 7000 N Mopac Expy Suite 425, Austin, TX 78731 USA
[17] Univ Southampton, Southampton, Hants, England
[18] Ecole Mines St Etienne, St Etienne, France
[19] HPI, Prof Dr Helmert Str 2, D-14482 Potsdam, Germany
[20] Vienna Univ Econ & Business, Weldhandelspl 1, A-1020 Vienna, Austria
[21] FH St Polten, A-3100 St Polten, Austria
[22] Dept Informat Engn, Via Branze 38, I-25121 Brescia, Italy