@article{697490,
      author = {West, Bruce J., and Turalska, Malgorzata, and Grigolini,  Paolo,},
      url = {http://library.usi.edu/record/697490},
      title = {Networks of echoes imitation, innovation and invisible  leaders / [electronic resource] :},
      recid = {697490},
      pages = {1 online resource :},
}