Massimiliano Bonomi Davide Branduardi Giovanni Bussi Carlo Camilloni Davide Provasi Paolo Raiteri Davide Donadio Fabrizio Marinelli Fabio Pietrucci Ricardo A. Broglia Michele Parrinello PLUMED: A portable plugin for free-energy calculations with molecular dynamics. 1961-1972 2009 180 Computer Physics Communications 10 http://dx.doi.org/10.1016/j.cpc.2009.05.011 db/journals/cphysics/cphysics180.html#BonomiBBCPRDMPBP09