# SEARCH

** A Pair of Oscillators with Different Frequencies **

** Allele distribution/ frequencies differences **

** Difference frequencies, nonlinear optics **

** Difference frequency spectromete **

** Difference frequency, Doppler scattering **

** Difference-frequency generation infrared pulses **

** Difference-frequency spectrometer **

** Different Types of Low-Frequency Electrohydrodynamics **

** Frequency difference, nonidentical atoms **

** Frequency generation difference **

** Sum and Difference Frequency Generation **

** Three-wave mixing processes doubling, sum and difference frequency **