Thanks a lot for the list of recommendations!
After a short look at GRETIL, Abhinavagupta and Kshemendra seem to be the best (easiest available) ones to begin with.
 
@Jonathan: Yes, it’s for authorship attribution – I need some data to “calibrate” the statistical measures and test some basic assumptions.
 
Best, Oliver
 
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Oliver Hellwig, University of Düsseldorf