SEARCH Articles Figures Tables A Pair of Oscillators with Different Frequencies Allele distribution/ frequencies differences DFG (difference frequency Difference frequencies, nonlinear optics Difference frequency spectromete Difference frequency, Doppler scattering Difference-frequency generation infrared pulses Difference-frequency laser Difference-frequency spectrometer Different Types of Low-Frequency Electrohydrodynamics Frequency difference Frequency difference Frequency difference, nonidentical atoms Frequency generation difference Sum and Difference Frequency Generation Three-wave mixing processes doubling, sum and difference frequency