R help - Aug 2013 - greek symbols to postscript

I need to print greek symbols IN ITALIC to eps-figures [ideally, using the
"Century Schoolbook" font family]. I've found many ways how to
print e.g.
"mu", but didn't succeed to print "sigma",
"rho" or other; even without the
"italic" or "font family" restriction.

An example:

postscript(file="working_example.eps",family="CenturySch")
plot(1,1)
# prints latin "s" instead of the greek "sigma":
text(1,0.9,label="\u3BC + \u3C3",font=3)
# prints <U+3#C3> instead of the greek "sigma"
text(1,0.8,label=expression(italic("\u3BC" + "\u3C3")))
dev.off()

I use gsview 4.8 [with the standard installation of ghostscript 8.53] on
winXP SP3 to view the result.

THANKS for help!

Johann Preuss

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