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Recently, Yan-Xia Xu, et al. in the article Ref. [Phys. Plasmas \textbf{18},052301 (2011)] have studied the effects of various plasma parameters oninteraction of two ion-acoustic solitary waves in an unmagnetizedthree-dimensional electron-positron-ion quantum plasma. They have used theextended reductive perturbation technique, the so-called, extendedPoincare'-Lighthill-Kuo (PLK) technique, to deduce from the model governing thequantum hydrodynamics (QHD) differential equations leading to the solitondynamical properties, namely, Korteweg-de Vries evolution equations (one foreach wave) and coupled differential equations describing the phase-shift intrajectories of solitons due to the two dimensional collision. The variation ofthe calculated collision phase-shifts are then numerically inspected in termsof numerous plasma fractional parameters. In this comment we give some notesspecific to the validity of the results of above-mentioned article and refer toimportant misconceptions about the use of the Fermi-temperature in quantumplasmas, appearing in this article and many other recently published ones.

Comment on "Interaction of two solitary waves in quantum electron-positron-ion plasma" [Phys. Plasmas \textbf{18}, 052301 (2011)]