Teruyo Wada Masao Ikeda Yuzo Ohta Dragoslav D. Siljak Parametric absolute stability of multivariable Lur'e systems. 1365-1372 2000 36 Automatica 9 http://dx.doi.org/10.1016/S0005-1098(00)00052-2 db/journals/automatica/automatica36.html#WadaIOS00