“…This subject has been extensively studied for compartmental models of CSTR's and other experimental designs whose rate expressions are described by linear ordinary differential equations. A list of these investigations include isotope transient tracing of catalytic methanation in CSTR's [1,2], general reaction systems of arbitrary kinetic order [3], electrochemistry [4,5], and nonlinear parametric models [6], and recently a book concerning the identifiability of parametric models [7].…”