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@MISC{lopez2014patent,
        author = {L{\'{o}}pez-Mart{\'{\i}}nez, Javier and Gimenez, Antonio and Torres-Moreno, Jose Luis and Sanchez, Silvia and Garc{\'{\i}}a-Vallejo, Daniel and Jardon, Alberto},
         month = {{{jan}}},
         title = {Actuator including a mechanism having variable stiffness and threshold torque},
          year = {2014},
  howpublished = {WO 2014001585 A1},
           url = {http://invenes.oepm.es/InvenesWeb/detalle?referencia=PCT/ES2013/000123}
}