D. Kavranoglu et M. Bettayeb, SYSTEMS-THEORY PROPERTIES AND APPROXIMATION OF RELAXATION SYSTEMS, Arabian journal for science and engineering, 18(4), 1993, pp. 479-491
System theory properties of relaxation systems are revised and new pro
perties are developed. Approximation of relaxation systems using Balan
ced truncation, Singular perturbation balanced truncation, Hankel norm
model reduction, and H approximation schemes is studied. Some further
properties related to the H norm are explored. Application of the res
ults to power spectrum estimation is discussed.