Viola Sonates

I went on listening viola tunes for these days. It's said that there are few repertoires for the viola. So is true in comparison with other instruments. In my recollection, Nobuko Imai, one of the great violists, had recorded Ysaye's "Six Sonates pour Violon (or Violin) Seul" arranged for the viola. But I can't find the CD. Maybe I'm fooling myself.