Comment on Large amplitude double layers in a positively charged dusty plasma with nonthermal electrons [Phys. Plasmas 16, 063708 (2009)]

Abstract

The claim by Djebli and Marif [Phys. Plasmas 16, 063708 (2009)] that for the same plasma composition two sets of double layers with very different amplitudes and Mach numbers can be supported is erroneous and imputable to numerical errors. That one of these sets of double layers exhibits a decreasing trend is shown analytically to be impossible. © 2009 American Institute of Physics.