  Ghost-stochastic resonance is a noise-induced resonance at a fundamental
frequency missing in the input signal. We investigate the effect of a
high-frequency, instead of a noise, in a single Duffing oscillator driven by a
multi-frequency signal $F(t)= \sum^n_{i=1} f_i \cos(\omega_i + \Delta
\omega_0)t$, $\omega_i=(k+i-1)\omega_0$, where $k$ is an integer greater than
or equal to two. We show the occurrence of a high-frequency induced resonance
at the missing fundamental frequency $\omega_0$. For the case of the
two-frequency input signal, we obtain an analytical expression for the
amplitude of the periodic component with the missing frequency. We present the
influence of the number of forces $n$, the parameter $k$, the frequency
$\omega_0$ and the frequency shift $\Delta \omega_0$ on the response amplitude
at the frequency $\omega_0$. We also investigate the signal propagation in a
network of unidirectionally coupled Duffing oscillators. Finally, we show the
enhanced signal propagation in the coupled oscillators in absence of a
high-frequency periodic force.
