Key points are not available for this paper at this time.
This is an introduction to a special volume of Nordlyd available at http://www.ub.uit.no/munin/nordlyd/. It outlines those aspects of Slavic verbal morphology which are of relevance to the papers in the volume, explaining various background assumptions, analytic motivations, and glossing conventions along the way, with reference to the papers in the volume. A full list of abbreviations for all the papers is provided in the last section.
Peter Svenonius (Fri,) studied this question.