In CJ the slur is written over the 1st group of the L.H. quavers. The second group is marked as repetition of the first, which, in this context, most probably also concerns the slur. There is no reason to question the authenticity of this slur, hence its absence in CK is probably a result of Kolberg's oversight. The slurs in CB are part of a comprehensive revision – see b. 6-19.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Balakirev's revisions, Errors in CK
notation: Slurs