A further asymptotic estimate of the amplitude for the two-parameter Scott - Murata oscillator and a similar estimate for a three-parameter oscillator

For the two-parameter Scott-Murata oscillator, an estimate of the asymptotic amplitude depending only on the parameter representing the input-output characteristic has been carried out by Ceschia in a previous paper. Here, some refinements of that estimate have been given, setting out explicitly the dependence of the amplitude on the other parameter. Following a similar method a new asymptotic estimate of the amplitude for a three-parameter oscillator is also reported.