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@MISC{modular_enose,
        author = {Sánchez-Garrido, Carlos and Gonzalez-Jimenez, Javier and Monroy, Javier},
         title = {Sistema electrónico para la medición de gases  (in Spanish)},
          year = {2015},
  howpublished = {ES patent -ES2553527},
           url = {http://invenes.oepm.es/InvenesWeb/detalle?referencia=P201400320}
}