I'm learning Shostakovich's wonderful 2nd sonata Op. 61. My Sikorski edition has a lot of (what seem to me) obvious mistakes, for instance 1st movement bar 25 the RH C# should surely be an A, as in LH bar 11. Does anyone know of a more reliable edition, or any discussion of these numerous apparent misprints? I have searched all over the internet but can't find anything. Recordings often reproduce the errors, eg. Gilels on YouTube plays that dubious C#.