Discussion: "A Résumé of the Development and Literature of Nonlinear Control-System Theory" (Higgins, T. J., 1957, Trans. ASME, 79, pp. 445–449)

L. M. Vallese
1957 American Society of Mechanical Engineers. Transactions of the American Society of Mechanical Engineers  
doi:10.1115/1.4013056 fatcat:p666iqzzive3vdcz5vpp3uvdx4