deletions | additions       diff --git a/Payam.tex b/Payam.tex  index 16aa947..c5fed5b 100644  --- a/Payam.tex  +++ b/Payam.tex 
...
\item Some reading about propagation of hydrodynamic information:\\  \citet{1995PhyA..214..185E},  \citet{Espanol_Rubio_Zuniga_1995} for evidence discussion  of sound-wave propagation;\\ how HD disturbances propagate and evidence for sound-waves;\\  \citet{Clercx_1997};\\  \citet{Kao_Yodh_Pine_1993} for high-speed experiment;\\  \citet{nderson_Mitchell_Bartlett_2002} describe an experiment where sonic communication is observed.