Systems & Control Letters
Systems & Control Letters > 1995 > 24 > 3 > 193-200
Systems & Control Letters > 1995 > 24 > 5 > 385-388
Systems & Control Letters > 1995 > 25 > 2 > 79-87
Systems & Control Letters > 1995 > 26 > 2 > 153-156
Systems & Control Letters > 1997 > 32 > 2 > 63-74