some text not showing up in PS file printed from a webpage

["H.S." <hs.samix@gmail.com>]

Hello,

Could somebody help me understand why I am not getting some symbols if I 
print this webpage:
http://www.facstaff.bucknell.edu/mastascu/eLessonsHTML/Freq/Freq5.html

to a PS file from Mozilla (1.7.12-1.2, on Debian Etch) using gs 
8.54.dfsg.1-5?

In the ps file, I am missing the "w" symbols, e.g. from the first 
equation in "Bode' Plots For First Order Systems" section. In w'is place 
I am getting an blank space in the output PS file.

thanks,
->HS