+o-110dt . (1.15) The stability condition in (1.12) can be restated as qco f t-a dt cico+b 0+00(1+010dt > 1-q 0 0+014 (1.16) According to Gradshteyn and Ryzhik, (Tables of integrals, series and products; Enlarged edition, I. S. Gradshteyn and I. M. Rhyzik; Academic Press 1980), these definite integrals can