INTERNATIONAL JOURNAL OF CONTROL, vol. 65, no. 5, page. 725 - 744, 1996-11-20
CONTROL ENGINEERING PRACTICE, vol. 4, no. 11, page. 1511 - 1520, 1996-11
AUTOMATICA, vol. 32, no. 5, page. 791 - 792, 1996-05
INSTITUTE OF PHYSICS CONFERENCE SERIES, vol. 145, page. 887 - 892, 1996-01