%0 Journal Article %T Further Observations on Blocking Zeros in Linear Muitivariabie systems (RESEARCH NOTE). %J International Journal of Engineering %I Materials and Energy Research Center %Z 1025-2495 %A Lucas, C. %D 1991 %\ 05/01/1991 %V 4 %N 1 %P 72-75 %! Further Observations on Blocking Zeros in Linear Muitivariabie systems (RESEARCH NOTE). %R %X While attempting to clarify the confusion concerning the conceptualization of "blocking zeros" in state space in the recent literature, some new observations are made on the relationship between pole-zero cancellation and transmission blocking. An important distinction between uncontrollable and unobservable eigenvalue s is pointed out; and it is argued that the description of a Blocking Zero, at the functional-behavioral level, is not sufficient. %U