file rknstabint.shar for interval of stability of Runge-Kutta-Nystrom methods by Paternoster <beapat@dia.unisa.it>, Cafaro lang Mathematica ref J.Symb. Comp. (1998) 25, 383-394 file stabint.tgz for interval of stability of rational approximations by Paternoster <beapat@dia.unisa.it>, Cafaro lang Mathematica