Matilde P. Legua Isabel Morales Luis M. Sánchez Ruiz The Heaviside Step Function and MATLAB. 1212-1221 2008 ICCSA (1) http://dx.doi.org/10.1007/978-3-540-69839-5_93 conf/iccsa/2008-1 db/conf/iccsa/iccsa2008-1.html#LeguaMR08