“…However, even if highly grammaticalized, aspectual categories show considerable and principled variation across Slavic languages, as has been shown by a number of recent studies such as e.g. Stunová (1993), Petruchina (2000, Dickey (2000Dickey ( , 2005Dickey ( , 2008Dickey ( , 2015, Wiemer (2008), Vimer (2015, Fortuin, Kamphuis (2015), among many others. This variation reveals itself in such parameters as differences in the productivity of (secondary) imperfectivization (generally increasing from West to East, cf.…”