Propagation of ion-acoustic solitary waves in a collisionless, unmagnetised single-electron-temperature plasma containing warm positive and negative ion drifts of equal temperatures is studied. It is found that, if the ions have finite temperatures, then there exist two modes, namely the slow and the fast ion-acoustic mode. The effect of ionic temperatures and negative ions on phase velocities (the fast and slow ion-acoustic modes) of the solitary waves are discussed for the plasmas havin
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