Systems & Control Letters
Systems & Control Letters > 1995 > 25 > 4 > 243-249
Systems & Control Letters > 1996 > 27 > 1 > 67-72
Systems & Control Letters > 1996 > 27 > 3 > 157-167
Systems & Control Letters > 1996 > 28 > 1 > 11-22
Systems & Control Letters > 1998 > 33 > 2 > 115-124
Systems & Control Letters > 1998 > 33 > 2 > 105-114