http://www.csh.rit.edu/~adam/Progs/programs.html
but they require to install some extra Perl libraries.
+
+I would like to mention that Christian PĂ©lissier (author of a popular
+textbook on Unix in French) has posted a dtksh program in a french
+email list on Solaris x86 that also does the vcal to XAPIA
+conversion. His message is archived here:
+http://www.mail-archive.com/solaris_fr@x86.sun.com/msg02388.html
+
+Please add in the comments at the top of my AWK program the links to
+his dtksh program and to Adam Stein's Perl programs:
+http://www.csh.rit.edu/~adam/Progs/programs.html
+
+
Best wishes,
Edmond Orignac
+