Two Strategies for Fractional Sliding Mode Control of Integer Order Systems by System Augmentation: Application to a Servomotor * *This work has been partially supported by the FEDER Funds (Programa Operativo FEDER de Extremadura 2014-2020) through the grant “Ayuda a Grupos de Investigación” (ref. GR15178) of the Junta de Extremadura and by the Spanish Ministry of Economy and Competitiveness under the project with reference DPI2016-80547-R. | Publicación