Manuel Mazo Juan Carlos García García Francisco Javier Rodríguez Jesús Ureña José Luis Lázaro Felipe Espinosa Integral system for assisted mobility. 1-15 2000 129 Inf. Sci. 1-4 db/journals/isci/isci129.html#MazoGRULE00 http://dx.doi.org/10.1016/S0020-0255(00)00065-7