Guangren Duan 0001 George W. Irwin Guo-Ping Liu 0003 Partial eigenstructure assignment by state feedback: A complete parametric approach. 1890-1895 1999 ECC https://doi.org/10.23919/ECC.1999.7099592 conf/eucc/1999 db/conf/eucc/eucc1999.html#DuanIL99a